Pvc Outer Plug O.d 20-32 Mm Water Supply Pipe Fittings Threaded Water Pipe Plug 4 Points, 6 Points, One Inch Blocking Cap - Pneumatic Parts - AliExpress
Charlotte Pipe 6-in PVC DWV Cleanout Plug in the PVC DWV Pipe & Fittings department at Lowes.com
6" PVC DWV Cleanout Tee with Cleanout Plug/Wholesale Industrial Supply