Charlotte Pipe 4-in PVC DWV Flush Cleanout Tee in the PVC DWV Pipe & Fittings department at Lowes.com
Jones Stephens - Drain, Waste & Vent Cleanout Test Tee with Cleanout Plug: 4″ Fitting, Hub x Hub x FIPT, Polyvinylchloride - 96872197 - MSC Industrial Supply
NIBCO 4 in. PVC DWV Spigot x Cleanout with Plug Adapter Fitting C4816HD4 - The Home Depot
EZ-FLO 3 x 4 Inch PVC Cleanout with Brass Plug for Tubular Drain Applications, White, 15336 - Bathroom Accessories - Amazon.com
Ips Corporation Part # 86400 - 4 In. Plastic T-Cone Combination Cleanout Plug - Test Caps & Plugs - Home Depot Pro