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The integral design of the Taco 3450 Combi Valve combines a cartridge style backflow preventer with a pressure regulating cartridge style boiler feed valve into a unique one piece body configuration. Taco’s 3450 combination dual check backflow with atmospheric vent and boiler feed valve with purge auto-reset dial in pressure setting and adjustable indicator sets a new standard for performance and serviceability. Designed for use in hydronic heating systems the duel check backflow prevents heating system water from flowing back into the supply water piping if the supply pressure falls below the heating system pressure. The boiler feed valve automatically fills or refills make-up water the closed heating system to the desired cold fill pressure. Both the backflow and the feed valve contain cartridges that can be serviced or replaced without draining the entire heating system. Features Auto Reset from Fast Fill ASSE 1081-2014 Simple Pressure Adjustment Servicable Cartridge for both the Backflow and Feed Valve Adjustable 360 View of Pressure Indicator Large Adjustment Range Serviceable without draining the system One Piece Body Construction Stainless Steel Strainer Specifications: Size: 1/2Connection Type: Threaded Max Flow GPM: 25 Max Temp F: 210F Max Pressure PSI: 150 Min Pressure PSI: 10 View Product Overview View Submittal Sheet View User-Guide CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including lead which are known to the State of California to cause cancer birth defects and other reproductive harm.