grapestompers - winemaking supplies and wine kits
Search Products
Shopping Truck
Home
Catalog
Winemaking Information
Specials
Customer's Corner
Contact Us
About Us
Policies
Location

Bung Sizing Chart

grapestompers.com offers several different sizes of rubber bungs (stoppers) for home winemakers, so how do you know which one is the right size to fit your carboy or demijohn? It's easy... just use our handy bung sizing chart, shown below.

We carefully measured all the bungs we stock to make this chart. The diameter of the bottom is represented by the smaller number (middle column), and the diameter of the top of the bung is found in the right-hand column. All measurements are in centimeters.

To find which size is most compatible with your carboy, measure the INSIDE diameter of the carboy neck (in centimeters) and find the appropriate matching bung size in the chart below.

For instance, if the inside diameter of your carboy neck is 3.3 cm, then the correct bung size to order is #7.... if the inside diameter is 3.1 cm, then you'll want a #6.5 bung.

Bung Size

Bottom Diameter (cm)

Top Diameter (cm)

5.5

2.4

2.8

6.0

2.7

3.2

6.5

2.8

3.4

7.0

3.0

3.8

7.5

3.1

3.9

8.0

3.3

4.1

8.5

3.6

4.3

9.5

3.8

4.6

10.0

4.3

5.0

10.5

4.5

5.3

11.0

4.9

5.6

11.5

5.0

6.3

We hope this chart was helpful... and hope you understand why we use centimeters for measuring purposes... it's more precise, and a heck of a lot easier to read on a ruler than one thirty-seconds of an inch!