Small and mighty, the National Diversified Sales 9P12 3" White PVC Round Grate for S&D Fittings drains light flows of excess water from patios, decks, and around pools. Leaves and debris are blocked from entering the drain pipe to prevent it from clogging and backing up. Grate has an open surface area of 2.6 sq. in. and flow rate of 8 GPM. The 3 in. Round Grate connects to 3 in. Sewer and Drain (S&D) fittings such as an adapter to connect to drain pipe. The Drain Grate, also known as a drain cover, is made of polyvinyl chloride (PVC) treated with UV inhibitors. For use in non-pressurized underground sewer and drainage applications; maximum working pressure of 5 psi. Hassle-free limited lifetime warranty guarantees the NDS product is free from defects—or we’ll replace it.