Spiral fermenter air lock with red or yellow cap. 10mm diameter.

3-piece airlock in transparent plastic that fits ordinary plastic fermenters as well as FermZilla and Brewly fermenters. Easy to clean. Fits 9mm holes.

Better Brew Airlock 3 bubbles, fits in standard grommets for standard fermenter buckets. An essential piece of homebrew kit. This Bubbler Airlocks fits into drilled bungs and grommets. Designed specifically for homebrew.It lets the CO² pressure out without letting contamination back in.Just partially fill with water and you're done.