The 2WayAir System by Rock Smasher Engineering Allows Easy Inflation or Deflation of All Tires Simultaneously
If there’s one thing that all RVers can agree upon, it’s that checking and adjusting tire pressure on the motorhome and dinghy vehicle is a pain in one’s backside. Without a doubt, proper tire-inflation pressure is critical to safe travel, and tire manufacturers typically recommend that inflation pressure be checked and adjusted before and during your trips. But getting down on one knee and moving around a motorhome with a gauge and an air hose — if you can even find a source for compressed air — is a time-consuming process at best; in extreme temperatures, it can become downright uncomfortable. With six to eight tires on the motorhome and four on the dinghy vehicle, we don’t need to tell you how long the process can take. The fact is, as much as we all hate having to constantly check and adjust tire pressure, no one has come up with a more convenient way to do it — until now.
Rock Smasher Engineering (RSE) is a start-up company founded by a group of engineers who have designed suspensions for everything from road-race motorcycles to off-road trucks. As off-road enthusiasts and RVers themselves, they worked for several years to develop a system that would make it easier to manage tire pressure, and created a product they call 2WayAir.
2WayAir is a universal-fit central manifold system that allows users to inflate or deflate all tires on the vehicle at the same time using polyurethane manifold tubing, nylon cable ties, specially designed Schrader valves and an assortment of push-to-connect fittings. The idea behind 2WayAir is that it fits any vehicle (just specify four, six or eight tires), installs with a minimum amount of tools and can be repaired quickly and easily.
Here’s how the system works: The 3/8-inch manifold tubing runs along either side of the vehicle. It tees into smaller ¼-inch tubing that runs to each corner of the vehicle where one of the kit’s Schrader valves is mounted. Once the system is plumbed, all the user needs to do is connect “whips” to the Schrader valves on the tires and the connection points on the coach, which are Schrader valves up front and D-type connectors (the same as used on compressed air lines) rear. All tires can then be inflated via a centralized inflation point, which can be located anywhere it’s convenient. The system balances the pressure in all tires during inflation, so even if one tire is higher or lower than the others, they all inflate to the same pressure. And because the system is not pressurized unless the whips are attached and the system is in use, there’s no danger of losing pressure out of the tires if one of the lines were to become severed.
The system’s design is at once simple and sophisticated. For example, the central inflation point is a common Schrader valve, but all kits also come with a mini control valve that can be fitted with a common male D-type connector so you have the option of inflating with an air hose, an air/CO2 tank, etc. Polyurethane tubing rated to 150 psi was chosen instead of the more common nylon for several reasons. First and foremost, it’s flexible and can’t kink. Second, this particular tubing is food grade, meaning it is manufactured to a much higher standard than industrial tubing. Finally, it’s very easy to work with and cut, which makes it possible to install or repair the system anywhere.
To keep installation simple, all fittings are push-to-connect — no hose clamps are required. The tubing itself can be secured with two different varieties of UV-rated nylon cable ties: standard and mountable. The mountable ties have small anchors that push into an existing or predrilled 3/16-inch hole; simply push the anchor into place, insert the manifold tubing and zip it closed. RSE even supplies sections of hard polyethylene tubing to protect the manifold tubing wherever it is mounted, so there are no concerns over chafing. Last, but certainly not least, anyplace the manifold tubing passes through metal is bulkheaded, so the polyurethane never makes contact with sharp edges.
Realizing that the system could be used on anything from a short-wheelbase Jeep to a tag-axle motorhome, RSE designed 2WayAir to be modular so the base system can be custom tailored to the application and/or upgraded with a variety of available accessories. One of the most popular options is a liquid-filled, vibration-resistant air-pressure-gauge kit and a pressure-relief valve that can be set to the tire’s specific inflation pressure. Once the whips are connected, simply connect an air source, or in the case of an onboard air compressor, just turn on the compressor and open the valve. When the air pressure reaches the set point on the relief valve, the valve makes a loud “burping” noise. This is the valve bleeding off excess air, which prevents overinflation of the tires. Disconnect the whips, and you are ready to travel. There are also a variety of mounting brackets available so all accessories can be mounted in one place, or individually.
RSE offers its 2WayAir kits for four wheels (cars, trucks and vans), six wheels (duallies and motorhomes) and eight wheels (tag-axle motorhomes). And recently, the company released kits for single-, double- and triple-axle trailers, as well as a jumper hose kit that will connect the 2WayAir system on the motorhome to the one on the dinghy vehicle. By using separate valves and connecting/disconnecting whips, it is possible to inflate the tires on the coach and dinghy to different pressures.
To test the 2WayAir system, we contacted RSE and requested a six-tire master kit ($319.95) to be mounted on a Class A gas motorhome. RSE also recommended a 36-100 psi pressure-relief valve ($24.95), pressure-relief-valve mounting kit ($29.95), mounting bracket ($10.95) and tube cutter ($8.95), bringing the grand total to $394.75. Considering the convenience afforded by this system (which will likely outlast the vehicle), that’s a pretty reasonable price.
Since no shop space was available for this project, the system was installed right at the storage unit, proving RSE’s claim that 2WayAir can be installed pretty much anywhere. The installation took roughly three hours, and once connected, it worked as promised.
The 2WayAir system is an innovative solution to an age-old problem. Once you try it, you’ll never air-up your vehicle’s tires the “old” way again.
Rock Smasher Engineering
702-981-6081 | www.2wayair.com