Marketing InformationSpears® true union utility swing check and spring-assisted true union utility spring check valves offer a compact, high-performance check valve for landscape and irrigation, pool and spa, aquaculture, OEM 1 and many general-purpose applications. True Union design allows for easy in line replacement of maintenance-free sealed units. These valves feature long-life EPDM elastomer seats with weighted disc for full-flow with minimal restriction and positive shut-off. spring-assisted spring check model incorporates a positive pressure spring to assist in valve closing without slamming. Produced from PVC White or PVC clear material with socket, threaded or SR threaded end connectors in IPS® Sizes 1/2 in through 4 in.