Air Bag Control Valve
Controls the inflation and deflation of trailer air suspension bags. There are three basic modes for air bag control:

1. A manual system which requires the user to operate the valve to inflate or deflate the bags.

2. An semi-automatic system which the user must trigger the deflation but will automatically inflate the bags when the trailer park brakes are released.

3. A fully automatic system where both the inflation and deflation functions are performed based on the trailers park mode.
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