Fits 3/4 inch LF909, 1 inch LF909, 3/4 inch 909, and 1 inch 909

This total rubber parts kit is used for replacing or repairing the relief valve assembly on a lead free reduced pressure backflow assembly series 909 used to prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure. This kit consists of a diaphragm, two molded disc assemblies, two seat O-rings, RV O-ring, two piston O-rings, RV stem O-ring, flow tube O-ring and cover O-ring.