Blow-off tube
Revision as of 00:01, 19 October 2017 by Uncle Jesse (talk | contribs) (Uncle Jesse moved page Blow-off Tube to Blow-off tube without leaving a redirect)
A venting tube exiting a bung and either fitted with a valve or seated in a sulfite solution. When a demijohn or carboy is used as a primary fermentation vessel, the blow-off tube allows foam formed during the initial, violent period of fermentation to escape without disturbing the integrity of the airlock.