PIPE DECOR 1/2 in. Black Iron Cap (10-Pack) PDB CA-12-10 - The Home Depot
Black Pipe Fittings - 4" NPT Cap, 150# UL/FM
Ironwerks Designs 3/4 in. Iron Pipe Cap (10-Pack) IW-CAP-3/4-10 - The Home Depot
Southland 3/4 in. Black Malleable Iron FIP Cap Fitting 521-404HN - The Home Depot
3/4" Cap Fitting, PIPE DECOR Black Malleable Iron Fittings Fit Standard 3/4 Inch Pipes, Nipples and Fittings, Regular Plumbing Applications and Industrial DIY Furniture, 10 Pack - Amazon.com