This tapered #7 Rubber Stopper is the perfect size for sealing 3.0 and 5.0 gallon glass carboys. It has a 9 mm hole in the center, for use with an airlock or tubing.
- Top Diameter: 37 mm
- Bottom Diameter: 31 mm
- Length: 24 mm
#7 Rubber Stopper - Drilled Reviews
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