A device for locking a rod member is provided. The device includes a body section having a vertical hole therein, and a ring-type locking unit and a piston serially arranged along the hole, wherein the rod member is disposed in the hole to be axially movable through the locking unit and the piston. The locking unit may be a lock block including an outer ring having an inclined surface on one side thereof, thereby defining a wedge-type space, an inner ring coaxially disposed in one side of the outer ring and accommodating a pressurizing member interacting with the inclined surface, and a spring disposed in the other side of the outer ring so as to elastically connect the outer ring and the inner ring.

A tire inflation assembly includes an air chuck that has a pair of outlets that has a direction of air flow which is oriented at a unique direction with respect to each other. In this way the air chuck can be attached to the valve stem at a variety of orientations to enhance employing the air chuck to inflate the tire. The air chuck includes a locking mechanism which engages the valve stem for retaining the air chuck on the valve stem. The locking mechanism is urgeable to disengage the valve stem to remove the air chuck from the valve stem. A pressure gauge is integrated into the air chuck to display the air pressure in the tire when either of the outlets is attached to the valve stem.