SLGPC paddle switch 1/4" Control valve 21703 Cab Control Air Spring Activation Switch for Air Ride Suspension pneumatic keys. Port 1# connects to the air source (air compressor); Port 2# connects to your air bag (or other parts you want to inflate/deflate); There are 3 positions for the paddle valve: Position 1#: Neutral position, no air in or out from your air bag; Position 2#: Inflate the air from the air source to your air bag; Position 3#: Deflate your air bag.