The Groz Standard Hydraulic Couplers are designed to provide quick, and leak-proof connection with grease fittings. The narrow coupler body makes them useful for use on fittings with limited access. The fully hardened spring steel jaws ensure that the coupler securely attaches to the grease fitting providing a leak-proof seal for efficient performance. The coupler features a spring-loaded ball check valve that helps retain pressure. The milled slot at the end allows easy tightening, connecting, and disconnecting of the coupler from the grease/zerk fittings 

Amongst the most popular couplers, these are ideal for use with all hand-operated Grease Guns.