10" Round Gray Valve Box. PVC is a Schedule 40 DWV White Pipe designed for both above and below ground DWV (Drain, Waste, Vent) Applications. Pvc is generally used for both commercial and residential plumbing construction, and residential sprinkler systems. PVC and its fittings are glued together with PVC glue and primer. These, the glue and primer, are designed to create a seal that is leak proof and durable like the Pvc pipe. The 10" Round Gray Valve Box is a sprinkler valve protection box. The box allows the user to reach in and control the sprinklers manually.