1/2" PVC Schedule 40 Ball Valve. PVC is designed for above or below ground and even DWV (Drain, Waste, Vent) applications. PVC can be used for both commercial and residential plumbing construction. PVC and its fittings are often glued together with special glue that's designed to create a seal that is leak proof and durable like the pipe. This Valve however uses 1/2" Female NPT threads. Because PVC is fairly rigid, it is an excellent pipe choice for just about any application including water, air, and DWV categories. This PVC 1/2" Ball Valve is ideal for isolating areas in the water system and controlling the water flow.