Built with a 3/8" NPT connection and a robust W6P1 valve body

You should measure 24V at the coil with a multimeter to confirm the thermostat signal is reaching the relay

Engineered for a precise fit in Heil

and L125-30F across Lennox

or excessive heat coming from the coil housing

Watts 0899236 Repair Kit 323055-751 Built with a 3/8" NPTThe Watts 0899236 Repair Kit is a field proven solution for maintaining Reduced Pressure Zone (RPZ) Assemblies and Reduced Pressure Detector Assemblies (RPDA). Specifically engineered for the Watts Series 957 and 957RPDA, this relief valve rubber parts kit provides the essential elastomeric components to ensure drip tight sealing and precise relief valve venting. Designed for larger diameter backflow preventers ranging from 2. 5" to 10", this kit