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
1" Solid Black Rubber Stoppers Tapered Plug Rubber Cork Fits 1" ID | eBay