Fermentation Locks, also called Airlocks, are vital to the making of good beer and wine. An airlock is a one-way valve filled with water or vodka that allows CO2 gas to bubble off and prevents contact with bacteria in the outside air. A drilled rubber stopper is needed to make an airtight seal.

Drilled Stoppers

Size/Fits

Diameter Top/Bottom
(in mm)

#2
(fits beer bottles)

21/17

C5100

#3
(fits wine bottles)

24/19

C5102

$0.75

#5 1/2

C5104

$0.80

#6
(1/2 gallon jugs)

#6 ½
(glass carboys)

34/28

C5108

$0.75

#7
(6 ½ gal. carboy)

37/31

C5110

$0.95

#7 ½

39/32

C5112

$1.00

#8

42/34

C5114

$1.10

#8 ½

43/36

C5116

$1.30

#9 ½

46/38

C5118

$1.30

#10

C5118

$1.95

#10 ½

54/46

C5120

$1.75

#11

56/48

C5122

$2.20

#11 ½

63/50

C5124

$2.04

#13
(Party Pig)

67/58

C4638

$3.50

Solid Stoppers

#5 ½

28/24

C5135

$0.50

#6 (gallon jugs)

32/27

C5137

$0.55

#6 ½ (glass carboys)

34/28

C5139

$0.65

#7 (6 ½ gal. carboy)

37/31

C5141

$0.90

#7 ½

C5142

$0.80

#8 ½

C5143

$0.93

#10 ½

C5147

$1.41

#11

C5149

$1.49

#11 ½

C5151