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Magic Plastics Inline Check Valve 1 12in Slip Socket PVC 0821 15Magic Plastics Inline pool and spa plumbing water check valve, 1.5 slip socket with a 12 lb internal spring, Magic 0821 15. Used to prevent cycling or backflow of water within a 1.5 pipe. Installs in one direction only, to keep water moving in one direction only. Often used in front of the pump or heater, or before a chlorinator, to prevent back draining when the system is off.
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