Drilled Rubber Stopper No. 4 - Tapered Carboy Bung

This #4 Rubber stopper bung is drilled with 3/8" center hole to accommodate standard size air locks.

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Specifications:

• Made out of Rubber
• 1" Top Diameter
• 13/16" Bottom Diameter
• 15/16" Height
• Gum Laboratory Drilled Stopper