Just half fill with water and you're good to go. Bung Size.
6 x Fermentation Bubbler Airlocks & Bored Cork Bungs Demijohn Wine Beer Cider
10 x Fermentation Bubbler Airlocks & Bored Rubber Bungs Corks Demijohn Wine Beer
10 x Fermentation Bubbler Six Chamber Airlocks for Home Brewing Fermenting
3 x Fermentation Bubbler Airlocks & Bored Cork Bungs - Demijohn Wine Beer
6 x Bubbler Airlocks & 6 x Bored Rubber DJ Bungs
Airlock & Rubber Bung x 2 - Fermentation Bubbler Combo for Demijohn Fermenter
