1" Watts 800M4FR Anti-Siphon Pressure Vacuum Breakers prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage. Most commonly found, but not limited to, lawn irrigation systems, the pressure vacuum breaker is usually located outdoors. The 800M4FR offers a unique freeze resistant design. The device is Freeze Resistant, NOT Freeze Proof. Bottom inlet, side outlet. Full port, quarter turn ball valves on inlet and outlet. Fully testable. Constructed of high quality bronze.
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