Zurn 12-975XL Wilkins Reduced Pressure Zone 1/2-Inch Backflow Preventer Connection: FNPT X FNPT - Body Material: Bronze Temp. Range: 33 Degrees to 180 Degrees F Max. Pressure: 175 psi - Width: 6-1/4" - Length: 17-3/8" Standards: ASSE 1013, Foundation for Cross Section Control and Hydraulic Research At USC Compliance: IAPMO, CSA, UL, C-UL, AWWA C511