Benjamin scuba yoke Attaches to a scuba tank with a K-valve Female quick-disconnect coupling on end of hose Includes air pressure gauge (manometer) Fits all Crosman & Benjamin PCP air rifles Fits other PCP guns that have a male quick-disconnect fitting * No matter which Crosman or Benjamin precharged pneumatic air gun you own, this scuba yoke will connect your gun to a scuba tank with a K-valve.