Introduction: Universal Fermentation Airlock

Picture of Universal Fermentation Airlock

This instructable shows how to add an airlock to almost any hermetically sealed container.

Step 1: Tools and Materials Needed

Picture of Tools and Materials Needed

The tools and materials needed:

An airlock

1/4" plastic tube

PG 13.5 mm cable glands

A step bit or a 1/2" knock our punch

3/4" rubber washers

Total cost of consumables for one mount < 5 dollars.

Step 2: Make a Hole on the Lid

Picture of Make a Hole on the Lid

Use the step drill or the knockout punch to make a hole on the lid of your container.

The optimal hole size is one that the threaded end of the cable gland can barely fit through.

Step 3: Mount the Cable Gland

Picture of Mount the Cable Gland

Pull the rubber gasket on the threaded end of the cable gland.

Insert the cable gland and tighten the nut with a wrench.


Silicone rubber is a better sealer then a normal rubber gasket but I didn't want to open a tube of silicone for this project. If you have silicone rubber at hand feel free to use it :)

Step 4: A Note on Airlocks

Picture of A Note on Airlocks

Some airlocks may have edges left from the manufacturing process. You may have to sand them of to ensure an hermetic seal.

Step 5: Have Fun With the Variations and Create a Jumbo Air Lock

Picture of Have Fun With the Variations and Create a Jumbo Air Lock

Try out the flexibility of this method :)

I only used 1/4" tubes here but if you use a bigger cable gland you can easily mount a 1" tube on your container.

Here is the video that I got the idea from (now these are some serious fermenters !!!!)

Have fun with your fermenting :)


Berkana (author)2015-06-27

This is great! Can this work on metal lids? I have a large pickle jar that I would love to turn into fermenters, but the lid is made of metal.

GézaP (author)Berkana2015-06-29

Yes it works. The pickle jar you see in this instructabel also has a metal lid. I strongli suggest using a step drill for that.

Thanks for the idea. I will make an instructabel also on making large pickle jars into fermenters (If you want to write it tell me so I wont steal your idea :) )

Berkana (author)GézaP2015-06-29

Oh, don't worry about waiting for me to make an instructable for this; I'm sure converting a large pickle jar is not a new idea. Good to know this works on metal lids.

tomatoskins (author)2015-06-25

Really great info! Thanks for sharing and welcome to the community!

About This Instructable




More by GézaP:Universal Fermentation Airlock
Add instructable to: