The 1/2'''' 850TXL Full Port Bronze Ball Valve is tapped (FNPT x FNPT) and used on Zurn Wilkins small diameter Backflow Assemblies for throttling and balancing installations of low pressure steam, air, water, and non-corrosive gas or oil. Ideal for use in residential, commercial, and industrial applications where lead-free valves are required, the pressure rating for the 850XL is 400 psi WOG with a temperature rating of 33°F to 350°F at 50 psi. The quarter turn, full port ball valves feature bronze body construction with chrome plated brass ball.