Instead of using a 2 peice design like the #326 bottle valves #660 valves use a 1 piece bottle nut and nipple that is sealed with the supplied teflon gasket.
Nitrous Oxide Systems Genuine NOS16230 Nitrous -6AN-660 Bottle Nut adapter
00-34022 Nitrous Outlet -6 AN Bottle Valve Nut #660 With Gasket Aluminum Black
00-34023 Nitrous Outlet Gasket Washer For Bottle Valve Nut 660 Quality Teflon
00-34021 Nitrous Outlet -4 AN Bottle Valve Nut #660 With Gasket Aluminum Black
11100-6 Nitrous Express 10 lb Bottle, Lightning 500 Valve, -6AN Nipple
Nitrous Express 11725 Bottle Nipple 6AN for Lightning 500 Valve
