RELIABILT 1/2-in Black Iron Cap Fitting in the Black Pipe & Fittings department at Lowes.com
Cast Stainless Threaded Caps | Steel Supply LP
The Plumber's Choice 1 in. x 1 in. L Malleable Iron Pipe Cap Threaded Fitting 150 lbs. Application Black Pipe Cap (10-Pack) 0100BMCP-10 - The Home Depot
4" PVC Threaded End Fitting Cap, 10 count | SmartGuard