Taco 219-4 3/4 Sweat Bronze Horizontal Flo-Check Valve PDS7_B5USK85

For more than 40 years designers and installers have used Taco Flo-Cheks in forced hot water heating systems to prevent gravitycirculation during periods when the boiler is hot but the space heating zone is not wanted. This makes it possible to use the heating boiler to maintain domestic hot water year-round. You can also use Flo-Cheks in systems with multiple circulator zones to allow heat to flow only into the zones that are calling for heat. In addition the thumb screw can be opened manually for gravity feed applications if the main circulator stops operating.