Spears S1720C15 PVC True Union Utility Swing Check Valve, 1-1/2-Inch, Clear PVC clear true union utility swing check valve is engineered for maximum flow, quick response and positive shutoff Offers a compact, high performance check valve for landscape and irrigation, pool and spa, aquaculture, OEM 1 and many general purpose applications Angled seat and weighted flapper for low-pressure seal Suitable for horizontal or vertical up-flow installations Socket, threaded or SR threaded end connections