Solenoid Function Issue

[barf]

Thanks Nilao, the 5th wheel slide is possibly what the front valve is on mine. This picture I showed is connected to the center two valves, and has air to it without any dash switch giving it air (like the 5th wheel slide switch or air horn button). I'm thinking maybe it supplies air to the suspension, and will dump air when the dump switch is on. But I'd still like to know why such a strange looking 3 way connector!