SpecificationStandard jaw-type coupler features spring-loaded ball check valve. Fits all 1/8” NPT threads.For hand operated lube equipment only. Recommended working pressure is 4,500 PSI. Length 1-7/16”, width 5/8”.Carded. 10 per master.Plews/LubriMatic grease fittings are precision engineered to withstand the rugged use of most automotive, farm and industrial applications.