Airlock with Small Universal Stopper – Set of 2 (C6521)
Fermentation lock or airlock is a device that provides a one way route to gases. It allows carbon dioxide released during fermentation to escape from the carboy while not allowing air to enter back in. This prevents oxidation.
Rubber stoppers with a drilled hole sits on the mouth of the carboy and an airlock is fitted over it.
This is a Set of 2 – 3 piece airlock that comes with two stoppers for mounting them as well.