High Quality Bubbler Airlock for Wine and Beer Making. It is essentially a one way valve.
Bubbler Airlocks and Bored Bungs Set of 6 Wine Making Homebrewing
Fermentation Bubbler Airlocks and Bored Cork Bungs x 2 Demijohn Wine Beer
4 Pcs Fermentation Airlocks and 2 Pcs Bored Rubber Bungs Brewing Airlock for Home Brew Beer Wine Making
Almost Off Grid 4 x Bubbler Airlocks and 4 x Bored Rubber Bungs for Glass Demijohns, Homebrewing, Winemaking, Mead Making, Beer Making, Cider Making, Fermenting
Almost Off Grid 5 x Bubbler Airlocks and 5 x Bored Rubber Bungs for Glass Demijohns, Homebrewing, Beer, Wine & Cider Making, Fermenting
Almost Off Grid 10 x Bubbler Airlocks and 10 x Bored Rubber Bungs for Glass Demijohns, Homebrewing, Winemaking, Mead, Beer & Cider Making, Fermenting
