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Fermonster - The World's Biggest Wide-mouth Carboy


Effortless Cleaning: The wide 4" mouth lets you reach right in to tackle those dirty shoulders and edges. Plus, the smooth, rib-less sides minimize residual yeast build-up for easier cleaning and racking.

Maximize Your Yield: The cleverly indented bottom allows you to extract more liquid and less sediment when racking. Crystal-clear construction with volume markers ensures accurate measurements every time.

Safe & Secure: Made from 100% food-grade BPA-free plastic, this fermenter is built to last. Note: When using hot water, do not exceed 52° Celsius.


  • Original price $3.29 - Original price $3.29
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    Rubber Stopper - Drilled Carboy Bung for Fermonster (#10)

    Fits the Fermonster Carboys and Better Bottle Carboys. Rubber stoppers provide an air-tight seal to carboys, necessary for proper fermentation. BPA...

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  • Original price $49.99
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    Current price $42.99
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    Carboy - 6 Gallon Fermonster Wide-Mouth PET Fermentor

    Light but durable BPA-free PET plastic fermentor, with a 4" wide mouth big enough to fit your whole hand. 4" Wide Mouth BPA-free PET Plastic Inclu...

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    Original price $49.99
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    Current price $42.99
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    Current price $42.99
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    $4.39
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    Rubber Stopper Solid Bung for Better Bottle and Fermonster (#10)

    Rubber stoppers provide an air-tight seal to carboys, necessary for proper fermentation. BPA free and made out of Food Grade materials. Maximum T...

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  • Original price $52.99 - Original price $52.99
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    Carboy - 7 Gallon Fermonster Wide-Mouth PET Fermentor

    Light but durable BPA-free PET plastic fermentor, with a 4" wide mouth big enough to fit your whole hand. 4" Wide Mouth BPA-free PET Plastic Inclu...

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    Original price $52.99 - Original price $52.99
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  • Original price $21.99 - Original price $21.99
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    Carboy - 1 Gallon Fermonster Wide-Mouth PET Fermentor

    Durable BPA-free PET plastic fermentor, with a 4" wide mouth big enough to fit your whole hand. 4" Wide Mouth BPA-free PET Plastic Includes airtig...

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    Original price $21.99 - Original price $21.99
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  • Original price $7.69 - Original price $7.69
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    Monster Mesh FerMonster™ Strainer

    Custom made for FerMonsters and Vintage Shop PET Carboys providing a perfect seal. Use to reduce the headspace on any of Vintage Shop PET Carboys...

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    $57.99
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    Carboy - 7 Gallon Fermonster Wide-Mouth PET Fermentor with #10 Drilled Stopper and Airlock

    Light but durable BPA-free PET plastic fermentor, with a 4" wide mouth big enough to fit your whole hand. Comes with a #10 Drilled Rubber Bung/Stop...

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  • Original price $27.49
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    Current price $26.49
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    Carboy - 1 Gallon Fermonster Wide-Mouth PET Fermentor with #10 Drilled Stopper and 3-Piece Airlock

    1 Gallon Fermonster with #10 Drilled Rubber Stopper and 3-Piece Airlock.  Light but durable BPA-free PET plastic fermentor, with a 4" wide mouth bi...

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    Original price $27.49
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  • Original price $55.49 - Original price $55.49
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    Carboy - 6 Gallon Fermonster Wide-Mouth PET Fermentor and #10 Drilled Stopper and 3-Piece Airlock

    Light but durable BPA-free PET plastic fermentor, with a 4" wide mouth big enough to fit your whole hand. 4" Wide Mouth BPA-free PET Plastic Inclu...

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    Original price $55.49 - Original price $55.49
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  • Original price $7.69 - Original price $7.69
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    Fermonster | Replacement Lid (Solid)

    Solid Lid for Fermonster PET Fermenter. Excellent for cleaning after primary fermentation - fill the carboy with 1 gallon of PBW solution and turn ...

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    Original price $7.69 - Original price $7.69
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    Current price $7.69
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    Fermonster | Replacement Lid O-ring

    Replacement O-ring for the 6 and 7 Gallon FerMonster Lid. Replace your old and worn o-rings with new ones regularly to ensure tight seals and preve...

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    $2.99
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    Universal Stopper - Solid Carboy Bung for Fermonster (#10)

    Solid, plastic bung with longer taper. Fits a wider range of demi-johns and carboys. Lip prevents bung from falling into carboy. 41 mm - Bottom 51 ...

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  • Original price $44.98 - Original price $44.98
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    Carboy - 7 Gallon/27 Litre - Fermonster Wide-Mouth PET Fermentor with Spigot

    Light but durable BPA-free PET plastic fermentor, with a 4" wide mouth big enough to fit your whole hand. 7 US Gallon/27 Litre Spigot included 4" ...

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    Original price $44.98 - Original price $44.98
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  • Original price $9.87
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    Current price $9.49
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    Rubber Stopper - Drilled Carboy Bung for Fermonster (#10) - Pack of 3

    Fits the Fermonster Carboys and Better Bottle Carboys. Rubber stoppers provide an air-tight seal to carboys, necessary for proper fermentation. BPA...

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    Original price $9.87
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  • Original price $6.99
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    Fermonster | Replacement Lid

    Replacement Lid for Fermonster PET Fermenter.  Hole fits a #10 Stopper/Bung.

    Original price $6.99
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  • Original price $34.59
    Original price $34.59 - Original price $34.59
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    Current price $32.99
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    Mead and Cider Making Kit with Fermonster 1 Gallon Fermenter

    Everything you need to ferment 4 Litres of Mead or cider.  Honey/juice not included. 1 gallon Fermonster #10 stopper 3 piece airlock Lalvin D-...

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    Original price $34.59
    Original price $34.59 - Original price $34.59
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    Current price $32.99
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    Current price $32.99
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