The Alemite 6304-B is a hydraulic grease coupler with a metal seal and 1/8-inch NPTF female-to-female threads. The metal seal supports higher pressure ratings than rubber-seal couplers during equipment, automotive, and industrial lubrication work. The 1/8-inch NPTF female thread supports use with standard grease gun extensions and adapters. Supplied individually for industrial, contractor, and MRO lubrication-equipment programs.