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Taco Flo-Cheks have dependably stopped gravity circulation in forced hot water heating
systems for over 45 years. Flo-Cheks open automatically when the circulator starts running.
They feature a thumb screw to manually open the valve, and are available in a cast iron
universal body and a bronze sweat in-line configuration. A unique, re-designed weighted
check on the 221 and 222 models features an enhanced seating and quieter operation on
high flow systems