Watts 0794081 – lfrk 909 rv 2 1/2 – 3″ relief valve rubber kit this relief valve rubber repair kit fits the 2 1/2 – 3″ watts 909 series reduced pressure zone (rpz) backflow preventers. This kit includes all internal rubbers for the relief valve assembly. No check parts are included in this kit. No special tools are required for servicing. Genuine watts replacement parts. includes: relief valve diaphragm rv stem o-ring rv disc rubber rv piston o-ring rv seat o-ring rv sleeve o-ring bottom plug o-ring small rv diaphragm o-ring lube