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If your only putting 10-11 gallons of wort in you should have plenty of head space for krausen and that size fitting would work just fine for a blow off tube.
 
I am only throwing a 5 gallon batch in there tomorrow....I meanI will put a blow off tube on to keep out infection....butI guess its unnecessary for such a small batch.
 
Hi Louie0202,

The hose barb has 2 jobs - one is for your blowoff (run a tube to a small bucket of sanitizer). The other is you can use it to put CO2 into the fermenter (up to 4 psi) for pushing your fermented beer into a keg.

Cheers,

John/Stout Tanks and Kettles
 

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