You might also need

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

Silicone Plug for Airlock 23/29mm
Silicone plug for airlock 23/29mm with 9mm hole. Cylindroconical form, 23mm diameter in one end and 29mm in the other.

Better Brew Airlock 3 bubbles
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.

Better Brew Airlock Straight
Better Brew Airlock Straight, 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.