Model 320 3/4' (20 mm) inlets/outlet(s) Thermostatic Mixing Valve (TMV) of disposable cartridge construction. TMV features unique full range temperature control from full cold to field adjustable maximum temperature limit stop in a single handle turn. TMV can be set and locked to a single temperature and will hold outlet temperatures +/- 2°F (1°C) in the event of inlet pressure and/or temperature fluctuation/change.* Thermal shutdown capability protects operator in the event of an inlet supply failure. This model includes integral tandem valve comprising two (2) full port ball valves cross-linked by a stainless steel bridge piece and lever for simultaneous on/off control of Both inlet supplies. Complete assembly is mounted on a heavy-duty stainless steel backplate that is suitable for wall or column installation. Unit supplied fully assembled and pressure tested with strain relief and 3/4' (20 mm) coupling for hose attachment.