WW0887717, Watts, 1-1/4 - 2 IN 800M4-FR Freeze Resistant PVB Retrofit Kit

This 1-1/4 to 2 inch retrofit pressure vacuum breaker repair kit for series 800M4-FR prevents the reverse flow of polluted water from entering into the potable water supply due to backsiphonage. It consists of a float, spring, bonnet and bonnet O-ring. It is ideal in health hazard continuous pressure applications such as irrigation systems and industrial process water systems where the water enters the equipment at or below its flood rim.