Taco's cartridge pressure reducing valve brings the convenience of a single-piece cartridge to an already advanced pressure reducing valve design. The cartridge features an adjustable pressure gauge on its face, eliminating the need for an additional gauge. With the integral flow check, you don't even need to shut down your system to replace the cartridge. The valve features a Fast Fill mode that increases flow when the system is being filled and operates normally when your set pressure is reached. Reliable operation is a staple of Taco products and the "&b559&" is no exception. A shaft seal system protects the diaphragm from wear and tear while a steel strainer prevents clogs that adversely affect flow and efficiency. Establishing stable pressure in your system is easier than ever with Taco's cartridge pressure reducing valve.