Drilled gum rubber stopper. Used to provide a positive seal on fermentors. Drilled hole is compatible with standard airlocks.
Our rubber stoppers are manufactured from a premium-grade material. This makes the stopper soft, pliable and long lasting.
Top Diameter: 1.457"
Bottom Diameter: 1.181"
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Best Fit 3, 5 & 6.5 Gallon Carboys Bottom Diam. 1 3/16"
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