The Groz Professional Hydraulic Couplers in a 54 pcs merchandiser set are designed to provide quick, positive, and leak-proof connection with grease fittings. The hardened coupler body withstands high pressures without deformation, and 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 hexagonal nut allows easy tightening, connecting, and disconnecting of the coupler from the grease fittings 

Built with durability in mind, this range of couplers is ideal for use with all hand-operated Grease Guns.