Replacement Nitrous Bottle Valve for Small Aluminum Nitrous Cylinders .625-18UNF2A (5/8") Straight Thread with O-ring Seal Inlet 1/8" FNPT Outlet High Quality Chrome Finish, Meets all National Valve Standards 1800PSI Service Pressure, 3000PSI Safety High quality Chrome Plated and Polished Nitrous Oxide Bottle Valve for replacement on small Nitrous Cylinders such as 10oz to 20oz lb sizes typically used on motorcycles, ATV's and Snowmobiles.