แอร์ล็อคแบบสามชิ้นอย่างดี 1 เซต – High Quality Airlock 3-Piece type 1 set

Airlock 3-Piece Type

Used with the fermenter to let the CO2 out of the fermenter and prevent O2 (also other contaminants in the environment) which will result in wort oxidation and/or contamination. All you need to do is fill the airlock halfway with sanitizer (some people fill with vodka).