Affixed directly to a compressor or air hose, this 151/2 inch-long Dual Wheel Tire Inflation Adapter, which features a two-jaw chuck and remote actuator, provides the reach needed to "air up" (to a maximum 150 psi) the inner tires on grain-hauling, semis, and other large trucks. Connecting (locking on) involves pushing the chuck onto the tire stem thread. Disconnecting (unlocking) involves pulling the actuator collar back towards you to release the front jaws then pushing the collar away from you to release the rear jaws.