This combination water pressure-reducer and check valve diaphragm design prevents high-pressure damage often caused by city water systems. This high performance water entry limit water pressure safely to a nominal 65 PSI (50 PSI inline version only) while meeting or surpassing all check valve code requirements.Features: Quick, permanent wall mount Continuous protection from high pressure surges Fits standard hose fittings Built-in check valve Ports : 3/4x9D GSH-Female inlet, 1/2x9D NPSM outlet