Transition from 3 in. X 4 in. downspout to 4 in. Sewer and Drain SD pipe with the PVC Downspout Adapter. This adapter connects directly to drain pipe to convey downspout flows into the drainage system. The Downspout Adapter is made of polyvinyl chloride PVC and makes a Downspout X Hub connection. Meets applicable ASTM standards. 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. NDS offers free tools such as the Home Drainage Center, Calculators, and NDS Stormwater Drainage mobile app to help make your project a success. Founded in 1972, NDS is the preferred choice of professionals and the leader in stormwater management solutions with proven products, tools, and support to help you get the job done right.