Equipment specs
Fermonster 3 Gallon Wide Mouth Carboy: specifications
The Fermonster 3 Gallon Wide Mouth Carboy is a fermenter from FastRack, listed at $36.79. Capacity is 3 gallons.
At that capacity it suits small or split batches, since a fermenter or kettle has to hold considerably more than the finished batch volume.

Fermonster 3 Gallon Wide Mouth Carboy
FastRack
Three gallon wide mouth PET fermenter for small or split batches.
Price last checked at publication and changes often.
Fermonster 3 Gallon Wide Mouth Carboy specification
| Specification | Value | Source |
|---|---|---|
| Brand | FastRack | Listing |
| Type | fermenter | Listing |
| Capacity | 3 gallons | Listing |
| Tier on this site | beginner | Editorial |
| Listed price | $36.79 | Listing |
| Full listing title | FastRack 3 Gallon PET Wide Mouth Fermonster with Airtight Lid, #10 Drilled Stopper & Twin Bubble Airlock | BPA-Free, Food-Grade | Large Primary Fermenter for Home Brewing, Wine & Beer - 1 Pack | Listing |
Rows marked Standard come from a published equation, constant or manufacturer specification. Rows marked Convention are widely repeated brewing practice with no governing document behind them. The difference matters, so this site labels it rather than blurring the two together.
The Fermonster 3 Gallon Wide Mouth Carboy and similar equipment
Prices are those returned when this page was last built and change often.

Fermonster 3 Gallon Wide Mouth Carboy
Three gallon wide mouth PET fermenter for small or split batches.

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Frequently asked questions
- What batch size does the Fermonster 3 Gallon Wide Mouth Carboy handle?
- It is listed at 3 gallons, which suits small or split batches. Always leave headspace: a fermenter filled to the brim will push krausen into the airlock, and a kettle filled to the brim will boil over.
- Is the Fermonster 3 Gallon Wide Mouth Carboy worth the price?
- It sits in the beginner tier on this site at $36.79. Whether that is right for you depends on how often you brew. Equipment cost spreads across every batch you make, so a more expensive system that gets used fortnightly can work out cheaper per pint than a budget one that gets used twice a year.
Researched from published brewing formulas, manufacturer specifications and verified owner reviews. This is general guidance, not professional advice.