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Copper 1/2" One-Way Check Valve – Anti-Backflow Threaded Size:Full copper 4 points "name": "How many days willCopper 1 2" One Way Check Valve Reliable Anti Backflow Protection Keep your plumbing system flowing in the right direction with this heavy duty Copper One Way Check Valve. Designed for 1 2" (4 point) threaded connections, this male threaded valve automatically prevents water from reversing direction, protecting your water heater, toilet supply lines, bathroom pipes, and water meters from backflow and pressure surges. Built from solid copper for