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2air/4air/6air Tire Inflator/Deflator System

Visitor # 77486 since 13.AUG.2001

NOTE: Due to high order volume, it may take some time for production and shipments to catch up. Order backlog could be up to 4 weeks.

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Description:

Air pressure in your tires is the one of the most important factors that affect the performance of you vehicle off-road. Too much air and you loose traction, damage tires, break drive line components and have a rough ride. Too little air and you may loose a bead, pinch the tire between a rock and the rim, damage the rim, etc. With experience, you'll learn to choose the correct pressure for the type of terrain you'll be traveling over. However, knowing the pressure you want and getting the tire pressure in all 4 tires to that value is time consuming if you have to do one tire at a time. There are numerous products on the market that can speed the process for airing down, but none also help you when you air back up at the end of the trip.

You can now air down or up in one easy fast process, all 4 tires at once, with the 4air. Air down all four tires from 30 psi to 10 psi in about 90 seconds and assure exact tire pressure in each tire. Quickly air up all four tires at once, too. Sizes to fit most 4 wheel drive vehicles. This system is modeled after the Quadra-Flate system popular back in the mid-90s (no longer available), but has been refined after over 10 years of extensive field use. The 4air system will let you air up all your tires at the same time and maximize the air output of your air source. As soon as the first tire is connected to the air hose, air will be flowing from your air source into your tire. As you hook up each additional tire, air continues to flow to all connected tires with pressures equalizing automatically. So all the while you are moving from tire to tire connecting the hose, air is flowing. So the minute or so you spend connecting all the tires is used to pump air into your tires. And unlike using a single air hose to air up one tire at a time, you may be wasting that time between filling one tire and moving to the next one.

Sure, you may have an air tank in the system to let your compressor store air between tires, it is likely of a small capacity and as it fills, the pressure can rise quite high, cutting into your compressor output. An advantage of the 4air hose is that you are essentially using the tires as your air tank and tires are much larger than a typical air tank. What that means is that if you have a small "tank" and a large "tank", the pressure in the large tank will rise much slower than the small tank for a given flow rate. And look at any compressor flow vs. pressure rating and you'll see the flow drops off as the pressure rises. So if you have a small air tank in your system, it's pressure might rise to 90 or 100 psi in between tires. For example the compressor we use in our shop truck puts out 2.2 CFM at 0 psi but that falls to 1.8 CFM at 30 and about 1.0 CFM at 90 psi. So if I take a minute to move from one tire to the next and the small 2 cu.ft. tank in the truck hits 90 psi, the compressor output falls to about 1 CFM, so at that point the compressor output has dropped in half. With the 4air system, airing up tires from say 8 psi to 30 psi, as each tire is connected initially, the pressure is low, down around 8 - 10 psi, so the compressor output remains fairly near it's maximum output, perhaps 2 CFM. So you can nearly double the effective air output by keeping the air pressure as low as possible for as long as possible. This also puts less load on your compressor motor (assuming electric) and keeps the heat buildup in the compressor itself, higher pressure = higher temperature. And if you have no storage tank with your compressor, then if you move from one tire to the next tire, the compressor will shut off and you get 0 CFM out of your compressor. Pretty simple to do the math there if the compressor is not running, you are not filling your tires.

This system has a number of benefits:

The 4air system is available in 3 standard sizes:

We also can make systems to handle 2 (2air), 4 (4air), 6 (6air) or more tires, as you need. Systems are designed to work with tires up to about 44" in diameter (thus 24" length of the stub hose at each tee fitting). The hose lengths are designed to accommodate the maximum wheel base in the size range above (including the worst case situation of having valve stems end up on opposite sides of the wheels), but can be used on vehicles with up to 15" longer wheel base if needed. Built with high-pressure 1/4" ID hose and uses 1/4" NPT threaded connections throughout for easy repair or modification. Quick release air chucks at all tires provide hands-free airing up and down.

The standard configuration includes 2 - 56" long hoses from the central air manifold to the first tee, where a 24" long stub hose is attached to connect to the tires on that axle. This is setup works will for connecting to a front mounted air source. If you wish to use the 4air from a rear air source or you have a very wide axle or extra long front overhang, additional runner length is available, $1.50/ft. for standard hose (4air-ash), $2.00/ft. for extreme duty hose (4air-aeh). The 2air systems can be set up to handle tires on one side (2air-s, 2air-m, 2air-l) or on one axle (2air-a) of a vehicle depending on your requirements.

For emergency use, you can air up a low tire by connecting the 4air to the low tire and your spare or to one or more good tires. The air pressure will self-equalize. For example, with one flat tire and three good ones at 32psi, you should end up with four tires at 24psi, which would be enough to get you home.

Most importantly, the 4air, unlike the Quadra-Flate, is designed for total flexibility. With the use of standard pipe thread fittings, it is possible to reconfigure the unit to meet your needs. We prefer an air chuck and Schrader valve on ours, but you may want a Schrader valve and a gauge, 2 wheels or 4 or 6. With quick disconnect air chucks, you can change configurations in the field. Automotive type air chucks are readily available at hardware and auto parts stores, or we can supply custom setups. We also carry a small kit of fittings (see pictures following) including flexible air hose, quick connect tire chucks, various combinations of air chuck adapters, so if we find an air source, we can usually air up from it, otherwise we use our on-board air compressor.

Some folks may look at a 4air hose system as a frivolous accessory or "bling". When I first saw one, I too thought the same thing. But after having and using one for better than a dozen years now, I can tell you it is the one off-roading accessory that I carry in my truck that I do use each and every time I go off-road, in fact at least twice on every trip. Once to air down and once to air up at the end of the trail. The winch on my truck has been used maybe half a dozen times in that same period of time. The Hi-Lift jack maybe twice that many times, my on-board welder, a couple of times, etc. But that 4air bag is right on top and gets pulled out at the start of the trail and I am always waiting for the other folks to finish airing down their tires and the sam thing at the pavement at the end of the trail.

Be sure to see the 2air product review on the 4x4Wire.com

Regarding the ParksOffRoad.com review of the 4Air system, we have identified the source of the slow air up/down times to a faulty batch of tire chucks that were internally restricting air flow. We have since changed suppliers for those parts and now test each and every chuck for adequate air flow upon kit assembly. So there should no longer be any significant difference in the time to air up or down one tire vs. all 4, since the basic bottleneck (source of air flow restriction) is the Schrader valve on the tire and not what is connected to that/those valve/valves.

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Specifications:

Standard 4air system includes:

2air/4air/6air options include:

(1)4air system and options(2)Quadra-Flate system, modified

(3)Closeup of various attachments (4)Closeup of coiled extension hose (4air-ext) (5)4Air Storage bag

(6)Clipless vs. clip-on chuck (7)Extreme-duty air hose and fittings

(8)Screw-on tire valve chuck (9)Screw-on tire valve chuck

(10)Screw-on chuck off of tire valve (11)Screw-on chuck w/ manual valve

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Theory of Operation:

The key to the 4air (and 2air) system is the central manifold. This is the key part that connects the two sides together to a common point and is also where the main controls are located as well as where optional accessories can be added:

Basic manifold:
- Male chuck
- Control Valve
- Schrader valve		 Adding options:
- Clip on Schrader valve
- 30 psi gauge replaces the
Schrader valve
4air-qd1 pressure gauge 4air-qd2 - quick disconnect gauge
4air-60 + 4air-qd1
- Pressure gauge w/ euro chuck		 4air-60 + 4air-qd2
- Manifold w/ female disc.
- Pressure gauge w/ male disc.

Think of the manifold as one of those round Tinker Toy pieces to which you can plug in various rods and other parts. You have 4 ports, two go to each side hose, one has a manual valve and exhaust port for airing down. The 4th port can have something in it. I prefer the basic Schrader tire valve, it lets me check the system pressure with a gauge, I can air up at gas stations, etc. If you prefer, a pressure gauge can replace the Schrader valve. Note that the digital gauge can't be installed on the manifold, it needs to use a Schrader valve connection.

I personally don't like having the pressure gauge hard mounted on the manifold (from years of experience).

Then, off the exhaust port and its quick disconnect air chuck, you can add other accessories for other purposes:

All these options are not meant to be confusing, its just a very flexible system. I have developed and used them all to address various needs in years of field use of the 4air system. Start out with the basic system and as you use it and encounter situations where you need to do something different, chances are. I've come up with something to address that need.

The tire valve chucks (either clip-on or clip-less) include automatic shutoff valves inside so they only flow air when connected to a Schrader valve on your tire. If left disconnected, they shot off the air flow. This allows you to connect the chucks to the tires without the air leaking out of the connected tires. Also, it allows you to set different pressures for different axles. For example, if you wanted to air up your back tires to 25 psi and the fronts to 30 psi, you could air up all 4 tires to 25 psi, then close the air valve at the manifold, disconnect the 2 rear tire chucks, then re-open the manifold valve and continue airing up the remaining 2 tires to 30 psi. With tires connected to the air hoses, and the manifold valve closed, the air pressure in all the connected tires will equalize automatically in a few seconds.

If you still are having trouble configuring a system for your own needs, send 4Crawler Offroad an e-mail and tell us what you want to be able to do and I can help you configure a 2air or 4air system to fit your needs. As mentioned elsewhere, I've set up systems to work off of Scuba tanks, I've built systems for big rigs to air up their "dualies", I've made systems that let you air up from a spare tire, etc.

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Chucks and more Chucks:

If you are confused by this chuck and that chuck, so was I (and still am to some degree :). In this page, there are two basic types of chucks:

Seems like every maker of anything to do with air has come up with a chuck of one sort of another. They all had perfectly good reasons for their own design, but invariably the different chucks would not fit each other.

Air chuck types

Click on the image above for a summary of the most common air chuck designs. I use the Milton or Industrial (M or I) type chuck, since it appears to be the most common chuck design. Air tools use it, most hardware and auto parts stores carry it and there is even a "universal" female chuck that fits both it and the type "T" chuck. Type T is made by TruFlate and is supposed to be a superior design (according to TruFlate) and they are pushing it for automotive use. The folks at Power Tank sometimes use type T chucks. I offer an upgrade to Type T chucks with the 4air-pt option (see below). If planning to connect the 4Air system to another air system, be sure to check the type of chuck required:

Type T on top, Type I on the bottom

Pictured above are the female and male Type T chucks on top and the Type I female and male chucks on the bottom. They are slightly different. Which one should you use?

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Instructions:

4air in action

Using the 4air system is very easy. In the picture, above, I've connected the 4air hoses to my valve stems, then connected the manifold to my compressor, using a coiled air hose. The chucks stay on the valve stems and I can walk away and do other things while the compressor fills the tires. To air down, just open the air valve and let the air out, in detail:

Pull back on housingSlip chuck over valve stem and release

One benefit of airing up all 4 tires at once, is that it slows the rate of pressure rise. This allows you more time to get your gear packed for the trip back home, re-connect sway bars, mud flaps, etc. without having to constantly check air pressures. With 33x9.50 tires and a 2.2 CFM on-board compressor, it takes about 6-7 minutes to air up from 15 to 30 psi, or about 2 psi/minute. With larger 33x15.50 tires it takes about 15 minutes to go from 10-30, so you have plenty of time to do other things without checking on the tire pressure or moving the air hose from tire to tire. If you have a high-capacity air system, this may not be as big a benefit, but for an electric compressor, this alone will pay for the system.

I have a page with information on tire inflation and deflation information located here. I did some timing measurements with deflating a set of 33x10.50-15 tires from 30 psi to 15 psi.

Important Notes:
1. If you have a 2air or 4air system with a built-in gauge, especially the lower pressure versions (0-30psi), you need to exercise a little caution with how you connect the system and use it. What you want to do is avoid over pressuring the gauge with air. So for example, to air up your tires, you would first want to connect all the air chucks to the tire valve stems. Only then do you want to connect your air source to the chuck on the inflator manifold, doing so with the air valve closed. Then, slowly open the air valve to allow air to flow into the tires. If you were to first connect the air source to the manifold and open the air valve, the air hoses (and gauge) would run up to air pressure of your air source, maybe 100psi or higher.
Several options are available if you still wish a built-in gauge but want to be able to disconnect it when not needed. You can order the gauge of your choice with an extra air chuck to screw onto the gauge and a Schrader valve to screw into the manifold. This way you can clip the gauge to that manifold Schrader valve and it'll work just like it is built in and you can also use that same gauge on individual tires as well. Another option is to attach a female quick disconnect on the manifold and a male quick disconnect fitting on the gauge and this way you can put the gauge in place and it'll be as solid as if it were screwed into the manifold and you can easily unplug it if needed.
And fear not if you do happen to over pressure the gauge. You may notice that the gauge reading is off afterwards. But it is a simple matter to unscrew the face off the gauge and remove the two small screws in back and slide out the gauge workings for adjustment. There is a copper "Bourdon Tube" that operates the gauge. Is is essentially a flatten copper tube wound into a "?" shape. It is very easy to adjust the tube, just like they do in the gauge factory. Take a pair of small needle nose pliers, wrap the tips with some tape to protect the soft copper. Then gently fold the tube near the middle of the curved part (you do not want to apply any force on the pliers) and gently twist the tube inward to reset the needle. The way the tube works is that as pressure builds inside, it tries to straighten out (kind of like one of those party toys you had as a kid). So if the tube is over pressured, it will be a little too straight and you want to very gently bend some curve back into it. Start easy and give just the slightest twist with the pliers, then release the tension and see where the needle points. If it needs to go farther to sit properly at 0 psi, then repeat the twist with just a tiny bit more pressure and recheck. Once you get the feel for it, you can usually get the needle back to 0 in a few tries. The key is to be GENTLE, you don't want to crush or kink the tube. I have used this technique many times and it has worked well for me. Have even used it to "calibrate" the gauge for a more accurate reading, at least compared to a second gauge. This way I can make say a 30 psi reading on the 4air gauge match the 30 psi reading on my regular tire gauge.
2. Also, you should take care of the air chucks on the end of the hose. They are, after all, precision devices in order to fit the valve stems on your tires and seal properly. And they are often used in less than pristine environments, since the reason you are airing your tires down or up is that you are (or have been) off pavement. So take care not to needlessly expose the chucks to too much dirt and sand. Why will tolerate some dirt, but you don't have to over-do it by dragging the chucks through deep sand or step on them and crush sand/dirt into them, etc. If mine do get dirty, I'll hold them up and tap on a piece of wood or a tire sidewall to shake any trapped dirt loose. With the clip-less checks, you can also find grit getting into the sliding outer part. If that happens, hole the chuck with the hose end down and operated the sleeve up and down until the grit has worked free. If it gets really jammed up, you can pop the snap ring on the very end loose (do so some place clean and where parts will not fly out of sight). Then the sleeve can be slid off, exposing the internal spring and pair of clamping jaws. Note that the jaws are 4-sided, so can be rotated to expose a sharp corner if you find the exposed corner has rounded off with use. I've not had to do this with mine in over 10 years of use, so not a common thing that needs to be done. And, if you find any of the chucks getting stiff over time, a light spray of dry silicone lube on the moving parts (including inside) can help free them up. Avoid using any lube that will leave a sticky residue as this will just attract dirt over time.
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Configuration and options:

Configuration of the 4air/2air system components is listed below:

So, which parts do I need? Well, it all depends on what you want to do.

The systems will have an air control valve to let air in or out and a Schrader valve on the manifold to let you check air pressure with your tire pressure gauge or add air from a gas station air hose. The basic systems will also have tire valve chucks for all the tires they are designed to connect to and those chucks have automatic shut-offs to keep air from leaking out when not attached.

Then there are a number of adapters or upgrades you can add onto the basic system to suit your needs:

So, determine what all sorts of things you want to do with your 4air/2air system and the figure out which adapters/upgrades you need to do that. Or drop us an e-mail with a list of what you want to do and we can configure a system for you.

You can think of this system like a set of Tinker Toys, everything pretty much is plug and play.

About the only consideration you need to make is that there are male and female chucks and Schrader valves

And Schrader valves and different that quick disconnects.

And don't worry, if there is some combination of chucks/genders/types that we don't list, ask and we can probably come up with a solution for you. Nice thing is we make use of standard 1/4" pipe thread fittings on everything so it is usually just a matter of screwing the right bits together to make up a custom adapter or fitting.

Pricing and ordering:

Prices below do not include shipping, so after configuring your air hose kit, select a shipping option below...

Part Description Price (US$) Order
4air-s Small (up to 90" wheel base) 4air system $105.00
4air-m Medium (up to 110" wheel base) 4air system $110.00
4air-l Large (up to 130" wheel base) 4air system $115.00
2air-a One-axle 2air system $65.00
2air-s Small (90") 2air system $70.00
2air-m Medium (110") 2air system $72.50
2air-l Large (130") 2air system $75.00
4air-30 0-30 psi analog gauge $15.00
4air-60 0-60 psi analog gauge $15.00
4air-100 0-100 psi analog gauge $15.00
4air-dp100 0-100 psi digital gauge $100.00
***4air-qd1 Quick disconnect gauge upgrade w/
tire chuck attached		 $ 10.00
***4air-qd2 Quick disconnect gauge upgrade w/
quick disconnect chuck attached		 $ 15.00
4air-ext Coiled extension hose w/ chucks
also in rubber hose, $10.00 + length		 $20.00
4air-sv Quick-connect Schrader valve $15.00
4air-ac Quick-connect/spare air chuck $20.00
4air-dfl Automatic deflator valve (Oasis) $ 25.00
4air-bag Heavy canvas storage bag $20.00
4air-edh Extreme Duty Hose, 4air upgrade + $30.00
2air-edh Extreme Duty Hose, 2air upgrade + $15.00
*4air-edf Extreme Duty Fittings, 4air upgrade + $12.00
*2air-edf Extreme Duty Fittings, 2air upgrade + $ 6.00
Ctc Clip-type chuck, separate $8.00
*Clc Clip-less chuck, separate $10.00
*4air-clc Clip-less chucks, 4air upgrade + $8.00
*2air-clc Clip-less chucks, 2air upgrade + $ 5.00
**Euc Euro-style chuck, separate $10.00
**4air-euc Euro-style chucks, 4air upgrade + $8.00
**2air-euc Euro-style chucks, 2air upgrade + $ 4.00
Soc Screw-on valve chuck, 1/4" hose barb $ 10.00
4air-soc Screw on chucks, 4air upgrade $ 30.00
2air-soc Screw-on chucks, 2air upgrade $ 15.00
4air-vlv In-line air valve, price for each $ 12.50
4air-pt Change to Type T air chucks + $10.00
4air-ash Additional Standard Hose + $1.50/ft.
4air-aeh Additional Extreme Duty Hose + $2.00/ft.
6air-tee Extend 4air hose to handle 6 wheels $ 30.00
2air / 4air/ 6air - Options and Pricing
Prices below do not include shipping, so after configuring your air hose kit, select a shipping option below...

NOTES:

  1. * Clip-less chucks are available as a separate item or as an upgrade to existing 2/4air systems
  2. ** Euro-style clip-type chucks with the same options as the clip-less chucks. They feature a straight on design, vs. the right angle of the regular clip-type chucks, and have a more secure engagement than the regular clip-type chucks
  3. *** Quick disconnect air pressure gauge upgrades, described in detail here, must also order a gauge kit (4air-30, -60 or -100) to upgrade.
    1. Also noted that with the 4air-qd2 option, you replace the default Schrader valve on the 4air/2air manifold with a quick disconnect chuck. So if you still want the option of a Schrader valve on the system, order a 4air-sv (quick disconnect Schrader valve).
    2. Likewise, if you order a hard-mounted air pressure gauge (4air-30, -60, or -100), the gauge replaces the default Schrader valve.
    3. Or you can order the -qd1 or -qd2 option and then supply your own gauge as long as it uses a 1/4" NPT male thread base.
  4. All parts are field serviceable:
    1. 4Crawler Offroad can supply replacement hose sections, chuck replacement kits, etc. as needed
    2. For example, on the clip-on air chuck, the inner rubber sealing washer can wear out over time
    3. A quick fix that will nearly double its life it to open up the chuck, remove the washer and flip it over to start using the un-worn surface
  5. Kits are built to order. Typically about 1-2 weeks for fabrication and 2-3 days for US shipping and 6-10 days for international shipping.
  6. State, country or zip code needed for shipping/sales tax calculation:
    1. Add 8.75% sales tax for shipments to a California address
    2. Add $14.00 for regular or $17.00 for insured shipping on complete air hose systems, assuming US delivery, for a total
      1. Typical US shipping time is 2-3 days
    3. Inquire for international shipping options and also supply a local phone number for customs paperwork
      1. New flat rate shipping to Canada/Mexico of US$41.00 for all the above kits
      2. New flat rate shipping to most of Europe/Asia/Australia of US$61.00 for all the above kits
      3. Typical international shipping time is 6-10 days
    4. For smaller items like air chucks (up to qty. 4), shipping rates are typically US$4.00 for first class or US$8.00 for priority mail in the US or US$24.00 for international shipping.
  7. Questions?

Shipping and Ordering options below:

For shopping cart orders on full air hose kits, add shipping below:

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For shopping cart orders on chucks and other small parts, add shipping below:

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- Add $4.00 shipping 		Insured Priority US shipping
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Custom Systems:

If none of the above systems fit your application, custom 4Air systems can be designed to exactly fit your needs. Examples of custom systems are extra long wheelbase and/or extra wide 4Air hoses for full sized pickups. For this application, just supply the wheelbase and/or track width of the vehicle and add the cost of the extra hose length to the cost of the desired system above (don't forget that you need extra hose on each side of the 4Air system). Other custom systems include 6-way air hoses for vehicles with dual rear wheels such as RVs or dual rear axles, such as trailers. Also available are custom locations for the 4Air manifold (the place where the air compressor connects). Other custom system designs have adapted the 4Air hose to fit up to a Scuba tank regulator with a user-supplied air chuck fitting. Basically if you have an idea for an air hose setup, let 4Crawler Offroad know what it is you want and we'll see if we can design something to suite your requirements.

For custom systems, just specify the lengths of each hose segment of hose you need to reach from tire to tire and where you want the air manifold located. For easier measuring, you can use a length of rope or garden hose to run from point to point, allowing enough slack in the rope/hose to allow for easy access and then measure the length of the rope/hose needed. These systems are prices based upon the amount of hose and fittings needed.

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Background:

Original Quadra-Flate system

If you've read this far and are still confused as to what this is all about, perhaps a little background information is in order. Back in the late 1990's, an outfit called Quadra-Flate Enterprises was making a nifty gadget called the Quadra-Flate. They seem to have since gone out of business as far as I can tell. Anyway, when I got into 4-wheeling, I bought a Quadra-Flate system, based partly on this product review. Anyway, I used the QF system for a while, but began to run into some things I didn't like about it.

So after making all these changes, I ended up ditching the QF system and designed my own from scratch to avoid all these problems. The key features I found for off-road use are flexibility, reliability and redundancy. Over the years, I assembled a good collection of attachments for the QF system to make airing up and down easier.

I also designed the system so that it could be easily modified to adapt it for custom applications. All the fittings are standard 1/4" NPT (National Pipe thread Tapered), so you can unscrew one thing and screw in something else. For example, one customer uses his at an ocean resort where they need to pull boat trailers out of the water several times a day. He airs down then airs back up with a SCUBA air tank and SCUBA air fitting that simply replaces the quick-connect fitting. The pressure gauge, if you decide to use one, is easily replaced if damaged (trust me it *will* get damaged). I only use parts that I (and you) can easily obtain from most any hardware store. As such, I can built a 4air system to meet your needs, or you can modify it yourself if you are so inclined.

With the disappearance of Quadra Flate Enterprises and their excellent product, I wanted to make my version available so others could benefit from it. I find this is one of the most useful tools I carry in my 4x4, it gets used at least twice every trip. If you would like to own a real Quadra Flate, I no longer use mine and will sell it for $60 plus shipping. I've rebuilt most of the air chucks, the air valve handle is a bit broken but it still works. I could install a new brass valve for $10 additional. If interested, please contact me.

And, what's up with the name, anyway? When you pull out that coiled up hose and start hooking it up to your valve stems and someone walks up to you and says:

"What is that thing for?"

You can reply:

"Its 4air!" ( for air :)

Harry Lewellyn wrote an excellent article on "Tire Pressures for 4-Wheeling", highly recommended reading.

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Questions ---> Send email to me. <--- Comments

[Last updated: 01.April.2013]

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