This German made connector features a one way check valve, to allow gas into a keg, while preventing beer from seeping out. These release pressure at 3psi. For the gas side (usually marked IN) of a ball-lock equipped keg. This fitting is threaded, and fits our D03 and D21 Gas Connectors, as well as our D66 barbed adapter. 3" tall.
Note: These are precise factory fitted pressure valves, and should not be taken apart for cleaning (internal parts are not available as spares, and an assembly diagram is not available).