40XL-4, 1" MIP x 1" FIP, 4" Thermostat CSA Temp. Steam Rating BTU/HR 500,000. ASME Pressure Steam Rating BTU/HR @ 75psi set pressure 1,155,000, @ 10... Read More at PlumberSurplus.com
Watts Regulator Temperature and Pressure Relief Valve 40XL-8, 3/4" (0158774) 40XL-8, 3 /4" MIP x 3 /4" FIP, 8" Thermostat CSA Temp. Steam Rating BTU/... Read More at PlumberSurplus.com
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/... Read More at PlumberSurplus.com
Watts Regulator Temperature and Pressure Relief Valve 40XL-4, 1" (0163725) 40XL-4, 1" MIP x 1" FIP, 4" Thermostat CSA Temp. Steam Rating BTU/HR 500,... Read More at PlumberSurplus.com