White Rubber drilled stopper #10
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#10 rubber drilled stopper (medium; fits 3,5,6 gallon Pet Carboys); Plastic bung with a drilled hole for airlocks. This universal style has a longer taper than rubber stoppers, for a snug fit and better seal. Fits plastic carboys, Bubbler PET fermentors. Top Diameter: 2.375" Bottom Diameter: 1.656"