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Fermonster 7 Gallon Widemouth Carboy Fermentor

(9 reviews) Write a Review
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The Fermonster 7 gallon fermentor is a clear PET carboy with a built in 7 gallon marker for easy to read convenience. It features a 4'' wide mouth opening and rib-less walls to make transfers, additions and cleaning quick and easy. It's light weight and durable design help with transportation and batch loss due to carboy drops.

Like Glass, PET Plastic won't let through any oxygen spoiling your batch. It's colorless, odorless, and stain resistant. The only negative to using PET is the fact that it can scratch, and scratches can be places bacteria will hide out in. But a little care when cleaning will prevent scratching and keep you and your carboy happy. Too big? Also check out our 6 gallon Fermonster product.

Use carboy stopper size #10

General Info

  • PET Plastic
  • Taste/Odor Free
  • Stain Resistant
  • Impermeable to Oxygen
  • Use carboy stopper size #10
  • Rated to 140 degrees F
  • Height: 20.9 inches
  • Diameter: 11.3 inches
  • Easy to Clean!

WARNING: This product can expose you to Vinyl Chloride, which is known to the State of California to cause cancer. For more information go to:

9 Reviews

  • 4
    It does the job

    Posted by Devin Stinson on Feb 10th 2021

    I picked up these fermenters thinking they would be a good addition to the equipment list. They work good as a fermenter, but the plastic is not rigid. Very flimsy sides. Once it’s full it is very difficult to transport. I highly recommend to get a carboy carrier to transport this anywhere beforehand.

  • 5

    Posted by Dustin L. on Apr 12th 2017

    Fast shipping product is great

  • 5
    Well Worth The Money!!!!

    Posted by john o. on Mar 13th 2017

    Already in use of both 7 gallon Fermonsters! And what's really nice is the lids are wide enough to use the Brewjacket cooling/heating device if one wanted to know. I have a Cool Zone insulated cooling/heating kit and I had to do a minimal modification to use the thermowell through the #10 stopper and drilled an additional hole for CO2 venting. Other than that it's pretty much the same as most fermenters just bigger! I would recommend purchasing a fermenter carry strap because this bad boy will get heavy.

  • 4
    Decent simple fermentation vessel

    Posted by jason b. on Mar 6th 2017

    If you got a thick arm, the widemouth on this wont be big enough. Otherwise, its a simple - thin plastic fermenter. I got it to work with the BrewJacket cooling/heating kit and the fermonster fits very, very well.

    Downside is, there is no easy way to pick these up, no handles, or wide brim...

  • 5
    Fermonster 7 Gallon Widemouth Carboy Fermentor

    Posted by James P. on Nov 1st 2016

    A good size fermentor and having the larger hole in the cap allows room for easy testing and racking.

  • 5
    Great product

    Posted by Keith on Sep 12th 2016

    This is a great product! It produced great resolts! I've always used glass carboys because I was worried about getting a plastic taste but that wasn't the case at all highly recommend this product and this company!!

  • 5
    Nice features in a fermenter

    Posted by Mike K. on Sep 5th 2016

    First, I like the extra half gallon size which made a difference in how much blowoff was in my last batch. I like that it also has an indentation and pilot dimple for drilling a siphonless spigot hole. That was a pleasant surprise since I use spigots with other fermenters. Lids fit securely and have gaskets which is another plus in my book.

  • 5
    Great product

    Posted by STEVEN on Sep 4th 2016

    The Fermonster is easy to handle and makes the brewing process easy. It also cleans easily and quickly.

  • 5
    Great product and fast shipping

    Posted by david B. on Jul 4th 2016

    Great product and fast shipping