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Rubber Stopper Sizing Reference Chart

Stopper Size
Bottom Diameter (Inches)
Top Diameter (Inches)
Avg. Diameter (Inches)
#2
5/8
3/4
11/16
#3
11/16
7/8
13/16
#5.5
15/16
1-1/16
1
#6
7/8
1-1/4
1-1/8
#6.5
1
1-1/2
1-1/4
#7
1-3/16
1-7/16
1-5/16
#7.5
1-1/4
1-1/2
1-3/8
#8
1-5/16
1-9/16
1-7/16
#8.5
1-7/16
1-11/16
1-9/16
#9.5
1-1/2
1-3/4
1-5/8
#10
1-11/16
1-15/16
1-13/16
#10.5
1-13/16
2-1/16
1-15/16
#11
1-15/16
2-3/16
2-1/16
#11.5
2
2-1/2
2-1/4
 
 
#00 Stopper fits and plugs the airlock hole in a drilled stopper so it can be used as a solid stopper
#2 Stopper fits standard wine bottle opening
#6 Stopper fits wine making and beer brewing industry ½ and 1 gallon jugs
#6.5 Stopper fits standard 6 gallon glass carboys
#7 Stopper fits standard 3, 5, and 6.5 gallon glass carboys
#10 Stopper fits standard 3, 5, and 6 gallon plastic carboys
#11 Stopper fits Demi Johns (14.25 Gallon Glass Carboys)
#11.5 Stopper fits most oak barrels
 
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