Stopper with hole for airlock. For sealing carboys, bottles and other containers.
Typical uses include:
#2 - Most wine/beer bottles
#3 - 3/4in (19mm) holes drilled in Oak Barrel Fermenter Lids
#6.5-#7 - Most 3, 5, 6, 6.5 gallon carboys
#6-#6.5 - Most glass growlers, 1 gallon & 4 liter jugs
#10 - Most plastic PET carboys
Please reference the chart below for further specifications.
| Size | Bottom Dia. (mm) | Bottom Dia. (in) | Top Dia. (mm) | Top Dia. (in) | Length (mm) | Hole Dia. |
| 000 | 8 | 1/3 | 13 | 1/2 | 21 | 5mm |
| 2 | 16 | 5/8 | 20 | 4/5 | 25 | 5mm |
| 3 | 18 | 5/7 | 24 | 1 | 25 | 5mm |
| 5.5 | 24 | 1 | 28 | 1 1/9 | 25 | 5mm |
| 6 | 26 | 1 | 32 | 1 1/4 | 25 | 5mm |
| 6.5 | 27 | 1 | 34 | 1 1/3 | 25 | 5mm |
| 7 | 30 | 1 1/6 | 37 | 1 1/2 | 25 | 5mm |
| 7.5 | 31 | 1 2/9 | 39 | 1 1/2 | 25 | 5mm |
| 8 | 33 | 1 2/7 | 41 | 1 3/5 | 25 | 5mm |
| 8.5 | 35 | 1 3/8 | 43 | 1 2/3 | 25 | 5mm |
| 9 | 37 | 1 1/2 | 45 | 1 7/9 | 25 | 5mm |
| 9.5 | 38 | 1 1/2 | 46 | 1 4/5 | 25 | 5mm |
| 10 | 42 | 1 2/3 | 50 | 2 | 25 | 5mm |
| 10.5 | 45 | 1 7/9 | 53 | 2 | 25 | 5mm |
| 11 | 48 | 1 8/9 | 56 | 2 1/5 | 25 | 5mm |
| 11.5 | 50 | 2 | 63 | 2 1/2 | 25 | 5mm |
| 12 | 54 | 2 1/8 | 64 | 2 1/2 | 25 | 5mm |
| 13 | 58 | 2 2/7 | 68 | 2 2/3 | 25 | 5mm |
