Unused but dirty from shipping. Connect 4 in. Sewer and Drain (S&D) pipe to 6 in. S&D pipe with the PVC S&D Increaser/Reducer Coupling. The coupler also connects 4 in. S&D pipe to select drainage products compatible with 6 in. S&D connections such as pop-up emitters, as well as 6 in. S&D pipe to select drainage products compatible with 4 in. S&D connections such as channel drain outlets and pop-up emitters. This coupling connects two different pipe diameters of S&D pipe. The S&D Increaser/Reducer Coupling is made of polyvinyl chloride (PVC) and makes a Hub X Hub solvent-weld connection. Meets applicable ASTM standards. For use in non-pressurized underground sewer and drainage applications; maximum working pressure of 5 psi. 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.