Sioux Chief 4 in. MPT x N/A in. Dia. MPT Plug 4 inch PVC polypropylene flush plug with threaded brass insert for easy cleanout cover installation will not seize up in ABS or PVC. Acid resistant and chemically inert are more durable than traditional plugs. Installed in a 4" PVC white DWV Cleanout to provide a flush fitting watertight access to the DWV piping system for cleaning or visual inspection. Jones Stephens has built its reputation over the years as a leader in the Plumbing industry, providing the market with thousands of products to complete any project. If you need it, we got it.