Taco's self-compensating Cartridge Style Pressure Reducing Valve, sets a new standard for performance and serviceability. All the parts are contained in a one piece cartridge which can be easily removed and serviced without reducing the system pressure. A fast-fill mode that automatically returns to the normal mode when the set pressure is reached and delivers increased flow to speed system fill times. Its unique dial-in pressure setting allows for easy adjustment throughout the 10-50 PSI range, without the need for an external gauge. Quality features include a stainless steel spindle, integral stainless steel coaxial strainer and easy, dial-up pressure setting that eliminates pressure gauges.