This tapered #10 Rubber Stopper is the perfect size for sealing plastic carboys like BetterBottle PET carboys. It is solid, and has not been drilled for use with an airlock or tubing.
Top Diameter: 50 mm
Bottom Diameter: 43 mm
Length: 26 mm
WARNING: This product can expose you to chemicals including Ethylene Thiourea, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.