This total rubber parts replacement kit is used for repairing the parts to the relief valve 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 discs, two disc assemblies, stem O-rings, cover O-ring, two seat O-rings and RV seat O-ring. Made for easy installation and use, it will help ensure the best service life possible.