Taco Hydronic Flo-Chek Valve, Universal, 2 inch Nominal Size, NPT, 125 PSI, 277 degree Fahrenheit, Mediameter Water/Glycol, Automatic Actuator, Cast Iron Body, 6-3/4 inch Width x 7 inch H
Taco Flo-Cheks prevent &; circulation inch forced hot water heating systems 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 hot water year-round. You can also use Flo-Cheks inch systems with multiple circulator zones to allow heat to flow only into the zones that are calling for heat. inch addition, the thumb screw can be opened manually for gravity feed applications, if the main circulator stops operating. 125 PSI maximum operating pressure (862 kPa) and 277 degree Fahrenheit maximum operating temperature (136 degree C).