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Your cart is empty.Watts Regulator Temperature and Pressure Relief Valve 40XL-5, 3/4" (0156731)40XL-5, 3 /4" MIP x 3 /4" FIP, 5" Thermostat CSA Temp. Steam Rating BTU/HR 200,000. ASME Pressure Steam Rating BTU/HR @ 75psi set pressure 777,600, @ 100psi set pressure 997,600, @ 125psi set pressure 1,217,600, @ 150psi set pressure 1,437,600. The combined 2 -in -1 Temperature & Pressure relief valve provides the least expensive and proven means for protection against both excessive temperature and pressure emergency conditions. Fully automatic temperature and pressure relief protection for domestic hot water supply tanks and heaters based on the latest ANSI Z21.22 Listing Requirements for temperature discharge capacity. 40XL with test lever and extension thermostat for installation in hot water outlet within the allowable distance from the top of the tank based on latest ANSI Z21.22. Sizes: 3 /4" and 1" (19-25mm).; 150psi set pressure