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Spears True-Union PVC Swing Check Valve 4" S1720-40 Socket Custom Panel Subcategories__Franklin Std CB Easy Access Battery CompartmentSpears Utility Swing Check and spring assisted Utility Spring Check Valves offer a compact, high performance check valve for Landscape & Irrigation, Pool & Spa, Aquaculture, OEM and many general purpose applications. These maintenance free sealed units feature long life EPDM elastomer seats with weighted disc for full flow with minimal restriction and positive shutoff. Spring assisted Spring Check model incorporates a positive pressure spring to