Rubber Bung Size Chart
#8: 1-3/8” ~ 1-5/8”
When fermenting it is
a good idea to either
totally seal or create an
airlock barrier between
your fermentables
and the outside world.
Rubber stoppers (bungs)
come either drilled for
a standard size airlock
or small blow-off tube,
or solid for a complete
seal. These stoppers are
sized by number, but
many don’t know what
the equivalent in inches
is, or what works for
their brewing needs.
This chart will help you
quickly decide what
works with popular
brewing equipment and
give you the diameters
if there is something else
you need to seal.
#8.5: 1-7/16” ~ 1-11/16”
Enjoy!
SIZE:
Bottom Diam ~
Top Diam
Air Lock
Hole
#000: 5/16” ~ 1/2”
#2: 5/8” ~ 13/16”
#3: 3/4” ~ 9/10”
#5.5: 31/32” ~ 1-1/8”
#6: 1-1/16” ~ 1-1/8”
#6.5: 1-1/8” ~ 1-3/8”
#7: 1-3/16” ~ 1-7/16”
#7.5: 1-1/4” ~ 1-1/2”
Bottles
1000ml
Flask
2000ml
Flask
3 Gallon
Carboy
5 Gallon
Carboy
6 Gallon
Carboy
6.5 Gallon
Carboy
.5 Gallon
Growler
1 Gallon
Jug
#9.5: 1-1/2” ~ 1-13/16”
#10: 1-5/8” ~ 1-15/16”
#10.5: 1-3/4” ~ 2-1/16”
#11: 1-15/16” ~ 2-1/4”
#12: 2-1/2” ~ 2-1/8”
Check KEY
Most Popular
or Exact Fit
You could use
these too