Watts 0888012|WW0888012 - RK 008 B 3/8, 1/2

This 3/8 to 1/2 IN backflow preventer bonnet repair kit, series 008, is used to prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage on indoor point-of-use applications. It consists of a bonnet, bonnet O-ring and vent spring. It is ideal for indoor use on machines or equipment in general plumbing applications.