This 1-1/4 in lead free master tempering valve is designed for use in commercial and institutional applications, to mix hot and cold water to reduce high service water temperature to the building distribution piping system. It is designed for installation at the hot water source. It features a lead free brass body construction, a copper paraffin thermostat assembly and a lockable temperature adjustment for increased safety. Polysulfone internals resist excessive heat, liming and corrosion and a single-seat design ensures tight shut off in the event of cold water supply loss. This valve also includes three-in-one check stops to prevent cross flow, isolate valve for maintenance and integral screens to filter out debris. Listed to ASSE 1017 and IAPMO cUPC in compliance with CSA B125.3. The temperature range is 90 to 180 deg F and the maximum pressure is 125 psi.