Drilled Universal Carboy Bung / Stopper White, rubber bung with longer taper for snugger fit and better seal. Lip prevents bung from falling into carboy. – Sunset Hydroponics and Home Brewing
8.5 Rubber Stopper – Drilled, – Salt City Brew Supply
1 X Drilled Rubber Stopper #7 (Set of 3) - Walmart.com
Rubber Bungs Fits 18mm dia. hole - Drywite Main
FastRack Drilled Rubber Stopper (#10-3 Pieces)| Solid Rubber Stopper Bungs for use with Fermentation Airlock | Durable Carboy Bung |Tapered Bung for Corking Home Brewing Glass Carboys: Amazon.com: Industrial & Scientific
Rubber bung 35-41mm + hole
E8A82600 - Red Rubber Stoppers: Solid - 21mm | Findel International
Bungs: Rubber Bungs 1gal Bored (100's)
Rubber Bung Stopper with Hole for Airlock for Fermentation