PVC 1/2" Check Valve. PVC is Pipe is designed for both above and below ground medium pressure applications. PVC is generally used for both commercial and residential plumbing construction. PVC and its fittings are glued together with special PVC glue that's designed to create a seal that is leak proof and durable. Schedule 80 PVC can withstand pressure as high as 1230 PSI and is ideal for pressure situations that demand more strength and durability than schedule 40 or a class 200 applications. All PVC Schedule 80 pipe is manufactured from a Type I, Grade I Polyvinyl Chloride (PVC) compound. This means that it is generally resistant to most acids, bases, salts, aliphatic solutions, oxidants, and halogens. This Check Valve stops backflow & syphoning for swimming pools, hot tubs & spas, industrial applications, agricultural, & solar installations.