Taco 241-4 1" Horizontal (Bronze) Taco Flo-Chek control valve From the manufacturer: Taco Universal Flo-Checks are designed for use in hot water heating systems to prevent gravity circulation when the boiler is operating, but the space heating zone is not wanted. Taco Flo-Check allows to use the heating boiler for domestic hot water throughout the whole year. In systems with multipl
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