Amazon.com: MECCANIXITY Rubber Tapered Plug 13mm to 17mm with Hole Test Tubes Bungs Stopper Black for Lab Home 5 Pieces : Industrial & Scientific
Rubber O Rings Kit Assortment 10Pc × Clear/Black Conical Rubber Stopper Blanking Plugs Silicone Tapered Plug Seal End Cover Caps 1.5-16mm for Oil or Air Sealing, Professional Plumbing (Size : 1x6x3: Amazon.com:
Amazon.com: 12-Pack (Same Size) Solid Rubber Stoppers - Size #4-26mm (1.02in) x 19mm (0.74in) - 28mm (1.10in) Long - Black Lab Plug : Industrial & Scientific
Replacement 1/2" Rubber Stoppers plugs for Salt and Pepper Shaker Pair #3 White | eBay
4 Solid Rubber Stoppers 1 Hole Lab Tapered Plug Bung Cork Fits 13/16" to 1" ID | eBay
Bottle Plug Rubber Stopper #6.5, 1 Center Hole, Plug 1 1/8" To 1 1/4" ID Hole | eBay