Fermentation Airlock & Bored Rubber Bung.

Lets CO² out without letting contamination in.

Just half fill with water and you're good to go.

The Fermentation Airlock is a standard size so fits all Fermenters.

The Bung fits Standard Glass Demijohns.

Bung Size:
Top : 31mm (approx)
Base : 27mm (approx)