SpecificationDesigned for use with air powered equipment as well as hand guns. Heavy duty construction withstands higher pressures. 3 hardened jaws reverse for longer coupler life.2” long coupler with 11/16” diameter is tapped for 1/8” pipe threads. Recommended working pressure is 8,000 PSI.Carded. 10 per master.Plews/LubriMatic grease fittings are precision engineered to withstand the rugged use of most automotive, farm and industrial applications.