The PVC Cleanout Plug enables access to sewer and drain (S&D) pipe systems to feed a plumbing snake into a clogged drain pipe. Attaches to, and removes easily from drainage fittings with threaded connections. The 4 in. Male Pipe Thread (MPT) connection on the plug fits 4 in. Female Pipe Thread (FPT) connections of other drainage fittings, sold separately. The drain fitting is made of polyvinyl chloride (PVC). 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.