M05223 Double Bubble Airlock -- Double Bubble Airlocks act as a check valve, allowing wine to "exhale" during fermentation, while preventing the outside air (and wild yeast) from entering the carboy. It is easy to use, just fill the airlock half full of cooled boiled water, and plug it into the gum stopper/bung on top of the carboy.

Ship wt. 1 lb.