[Eric Westlund]

I'd like to try fermenting under pressure but I only want to brew small batches (2 or 3 gallons).  I have been looking at reasonably priced PET vessels that can be pressurized such as the various versions of the Fermzilla. I have read that it is not desirable to have a large amount of head space in the fermenter and the smallest pressure capable vessel I can find is in the 7 gallon range.  Is it a problem to ferment only 3 gallons in a 7 gallon vessel under pressure. If so, does anyone know of smaller pressure capable fermentation vessel.  Thanks.

[narcout]

A cornelius keg would work well, and they are readily available in 3 and 5 gallon sizes.

[HopDen]

I'd like to try fermenting under pressure but I only want to brew small batches (2 or 3 gallons).  I have been looking at reasonably priced PET vessels that can be pressurized such as the various versions of the Fermzilla. I have read that it is not desirable to have a large amount of head space in the fermenter and the smallest pressure capable vessel I can find is in the 7 gallon range.  Is it a problem to ferment only 3 gallons in a 7 gallon vessel under pressure. If so, does anyone know of smaller pressure capable fermentation vessel.  Thanks.

https://spikebrewing.com/pages/flex

This might fit the bill.

[majorvices]

I have a couple of these they work great for serving. No reason not to use them for your purposes

https://www.homebrewing.org/AIH-New-Double-Rubber-Handle-25-Gal-Keg_p_5101.html?utm_source=google&utm_medium=shopping&gclid=CjwKCAjwg4-EBhBwEiwAzYAlsjhXBWm7Hn267TG1Op8iSjCdYs1nzyjAlofhbekIHa6gfR8HUFc0yRoC150QAvD_BwE

[erockrph]

I use 5 gallon kegs as my fermenters for 3 gallon batches. I use them for both pressurized and non pressurized batches. They work great for me, especially now that I've started using a floating dip tube instead of the standard one. Aside from pressurized ferments, they also allow for spunding and closed transfers to your serving kegs.

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