Watts RETRO800M4-FR 0887726 1/2 inch and 3/4 inch Lead Free Backflow Preventer Retrofit Kit

Fits 1/2 inch 880M4-FR and 3/4 inch 880M4-FR

This retrofit pressure vacuum breaker repair kit which 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.