The Chassis Inlet Receiver should be mounted on a rigid structure on the car to receive the Air Jack Inlet Wand (Part No. 1860-104, sold separately) on your air hose. The 3/8 NPT male threads mate directly to the Manual Gate Valve, Part No. 1860-105 (sold separately).
In the heat of battle, this receiver can be hit fairly hard with the wand. You may need to fabricate a support bracket for the receiver if the body of the car is not strong enough to take the abuse.