Amazon.com: Black Nylon Hole Plugs Fits 1 1/8" Diameter Hole - Slightly Domed Surface - Durable Nylon Plug Snaps Into Hole with Locking Tabs That Hold in Place (6) : Industrial & Scientific
Amazon.com: Black Nylon Hole Plugs Fits 1 1/8" Diameter Hole - Slightly Domed Surface - Durable Nylon Plug Snaps Into Hole with Locking Tabs That Hold in Place (12) : Industrial & Scientific
1-1/2" Nylon Plug - F112 | FarmChem
RAWLPLUGS WALL PLUGS EXPANDING NYLON PLUG ANTI SPIN - M8 or M12 Choose Quantity | eBay
Plug 1/4" or 8mm BSP Thread - Hansen - Nyglass (Glass Reinforced Nylon) - Irrigation Warehouse Group Pty. Ltd.