The Xylem-Bell & Gossett 132126 3Ds-6S Triple Duty Valve is a cutting-edge component intended to improve HVAC system efficiency and performance. This unique valve streamlines installation and eliminates the need for numerous separate valves by performing the functions of a balancing valve, shut-off valve, and check valve all in one. https://www.partshnc.com/132126-xylem-bell-gossett-3ds-6s-triple-duty-valve-6