#3 Drilled Rubber Stopper Bung
15/16″ top diameter, 3/4″ bottom diameter.Fits standard 750ml wine bottles and assorted soda keg lids.Pure white gum laboratory Stopper drilled with 3/8″center hole to accommodate standard air locks.

California Proposition 65

Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.