Hoffman Specialty model 21 tempering valve with a 3/4" NPT connection for water with an adjustable 140-200&degF temperature range, a maximum pressure of 125 psig, and a maximum hot water supply temperature of 235&degF. Hoffman Specialty tempering valves are designed to control temperature in water mixing applications such as radiant floor heating and industrial processing. They can also be used to divert flow in cooling systems. Series 21 valves can be used for residential, industrial, commercial, or institutional applications. They feature a fast acting, corrosion resistant actuator which actuator exerts high operating force and provides reliable service. Model 21 provides wide temperature adjustment range for hot and cold water mixing in applications other than domestic hot water.