NIBCO 3/4 in. PVC DWV MIPT Cleanout Plug PVC PLUG FOR CLEAN - The Home Depot
Jones Stephens - Drain, Waste & Vent Cleanout Test Tee with Cleanout Plug: 4″ Fitting, Hub x Hub x FIPT, Polyvinylchloride - 96872197 - MSC Industrial Supply
1-1/4" PVC Cleanout Plug, Type DWV
4'' PVC DWV Raised Head Cleanout Plug - Wallington Plumbing and Heating Supply Inc
4" DWV PVC Fitting Cleanout Adapter and Plug D112-040