This listing is for one of a DC002 threaded metal dust cap for EZ Oil Drain Valve truck valves, including E Z 200 series, plus E Z 2, E Z 3, E Z 4, E Z 5, E Z 6, E Z 7, E Z 7B, and E Z 8 valves. Threads onto the drain hole of the valve, delping keep the valve clean inbetween oil changes.