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Top: Here is the control panel shown from the rear. From this angle, you can get a better view of the push-to-connect bulkhead adapter on the mini control valve, as well as the push-to-connect adapters on the two Schrader inflation valves. Either Schrader valve can be used to admit air into the system with a common gas station air hose, while the other one can be used to check system pressure with a tire pressure gauge. Once fitted with a male D-type fitting, the mini control valve (shown in the closed position) can be connected to a compressed air hose and opened to admit air into the system, inflating all tires at once. The same valve can be opened without a hose attached to release air from the system and deflate all tires at once. Having two different styles of inflation valves is a great feature, especially when you consider how difficult it can be to find a filling station where a hose can reach all tires. A central inflation point allows the user to “nudge” up to the air source and inflate all tires without having to stretch a hose or move the coach from side to side. Middle: A popular option is to fit the 2WayAir system with a brass pressure relief valve, which was pre-set for this application at 95 psi. Once that pressure is reached, the valve “burps” excess pressure until the inflation source (air compressor, air tank or on-board air) is turned off. Above: Here, the control panel has been mounted to the side of the hitch receiver. The main 3/8-inch manifold tubing exits the rear of the mini control valve, then goes to a 3/8-inch to 1/4 tee that is plumbed to the pressure relief valve (top of frame). The loop of tubing ties the two Schrader valves together, and tees into the main 3/8-inch manifold.
The main manifold tubing continues to the front of the coach. A push-to-connect, 3/8-inch to 1/4-inch Y fitting splits the main manifold to the front Schrader valves on either side.

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