A blow off tube is a type of high flow airlock where a tube and bung or seal are placed at the high point of a fermenter that leads to a reservoir where the end of the tube is placed beneath a sanitizing solution. This allows for the expulsion of co2 and excess fermentation foam and fermentation solids. A blow-off is a great airlock to use when you...
Found on
http://www.westcoastbrewer.com/Beer_Glossary_and_Brewing_Terms.php
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.
Found on
https://www.encyclo.co.uk/local/22309
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