The 4" Swing Check Valve is engineered for high performance and reliability in both vertical and horizontal installations. Made from durable PVC and EPDM, this valve mounts seamlessly between 150 lbs ANSI flanges and DIN flanges without needing a spacer ring. Featuring a spring-assisted closing mechanism and an external sight glass with an indicator pin for easy monitoring, this check valve ensures efficient flow control and robust construction for long-lasting use.