Airlock - 3-Piece Bubbler and #6.5 Carboy Bung

This 3-piece airlock is ideal for primary fermenters, as it allows you to monitor the CO2 release from the fermenter. Fill to line with boiled water or sanitizer to create a closed system, which allows CO2 to escape, but doesn't allow air back in to contaminate your wine or beer.  Comes with a 6.5# rubber stopper for carboys and jugs.