The Powers #11 Water Mix Regulator is a self-actuating control valve which automatically maintains a mixture of hot and cold water at the desired set point without the use of external power. Adjust the set point and the rugged self-operating #11 Regulator controls the mix of hot or cold water to maintain a constant temperature. The instrument has a vapor pressure thermal system containing a thermally responsive fluid. This thermal system rapidly senses temperature changes at the bulb and accordingly positions the valve disc or plug, regulating hot and cold water flow to maintain the desired set point. The thermal system features a two-ply brass bellows with six reinforcing ribs on the bellows head and thick capillary tubing walls to insure long operating life. The Powers #11 WM Regulator features: • Tight disc shutoff when either of the two inlet ports are closed (up to 2") • EPT disc is replaceable (on 1/2"-2" valves). • Lower guide stabilizes valve plug, assisting shutoff and modulation. • EPT spring loaded V-ring packing provides good sealing and long life. • A valve stem of highly polished corrosion resistant grade 316L stainless steel to decrease friction and reduce hysteresis. • An adjusting nut mounted on ball bearings and a removable set point adjusting rod ease set point adjustments • A set point reference scale aids temperature adjustment.