GZ43544 – 17mm Quick-Lock Coupler The Groz Quick-Lock is designed for quick & convenient disengagment of coupler from grease/zerk fittings under pressure. Design permits usage of all profiles of grease fittings – SAE & Metric. Max. Pressure – 8000PSI / 550BAR. Thread – 1/8IN BSPT. 6-point contact design. For use with hand & air operated Grease Guns.