Caleffi’s 5231 Series low-lead, high-flow thermostatic mixing valves are available in 1”, 1 1/4”, 1 1/2” and 2” sizes with union-threaded or union-sweat-end connections. Operating flow rates range from 4.4 gpm to 70 gpm. Adjustable temperature settings range from 95° to 150° F. Designed for systems requiring high flow rates and precise, stable temperature control, the valves are IAPMO-certified low-lead brass and meet the requirements of ANSI/NSF 372-2011. They are easy to adjust and maintain mixed temperature variations to +/- 3° F accuracy.