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Rubber Stoppers / Caps

Critical to the home beer brewing fermentation process, rubber stoppers/caps help to create an airtight seal in the primary fermenter or fermentation carboy, two key pieces of beer equipment. E.C. Kraus offers a variety of rubber stoppers, which are available both with and without holes. Rubber stoppers that have holes accommodate airlocks, which allow the beer to release carbon dioxide during the fermentation process. Choose the right sized rubber stoppers/caps to fit your fermentation equipment and ensure that your home brew can ferment without exposure to air.

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  1. Size #1 Rubber Stopper

    Size #1 Rubber Stopper

    • Top diameter 3/4". Bottom diameter 9/16".
    • Made of pharmaceutical-grade, tan color rubber.
    • Available both with and without holes.
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    Price: $1.81
  2. Size #2 Rubber Stopper

    Size #2 Rubber Stopper

    • Top diameter 13/16". Bottom diameter 5/8".
    • Fits our Poly-Fermenters, Tuff-Tanks, and wine bottles.
    • Available both with and without holes.
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    Price: $1.88
  3. Size #3 Rubber Stopper

    Size #3 Rubber Stopper

    • Top diameter 15/16". Bottom diameter 3/4".
    • Made of pharmaceutical-grade, tan color rubber.
    • Available both with and without holes.
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    Price: $1.98
  4. Size #4 Rubber Stopper

    Size #4 Rubber Stopper

    • Top diameter 1". Bottom diameter 13/16".
    • Made of pharmaceutical-grade, tan color rubber.
    • Available both with and without holes.
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    Price: $2.09
  5. Size #5 Rubber Stopper

    Size #5 Rubber Stopper

    • Top diameter 1-1/16". Bottom diameter 7/8".
    • Made of pharmaceutical-grade, tan color rubber.
    • Available both with and without holes.
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    Price: $2.21
  6. Size #5.5 Rubber Stopper

    Size #5.5 Rubber Stopper

    • Top diameter 1-1/8". Bottom diameter 15/16".
    • Made of pharmaceutical-grade, tan color rubber.
    • Available both with and without holes.
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    Price: $2.36
  7. Size #6 Rubber Stopper

    Size #6 Rubber Stopper

    • Top diameter 1-1/4". Bottom diameter 1".
    • Fits our 1 gallon glass jugs.
    • Available both with and without holes.
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    Price: $2.42
  8. Size #6.5 Rubber Stopper

    Size #6.5 Rubber Stopper

    • Top diameter 1-3/8". Bottom diameter 1-1/16".
    • Fits our 6 gallon glass carboys.
    • Available both with and without holes.
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    Price: $2.63
  9. Size #7 Rubber Stopper

    Size #7 Rubber Stopper

    • Top diameter 1-7/16". Bottom diameter 1-3/16".
    • Fits our 3 and 5 gallon glass carboys.
    • Available both with and without holes.
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    Price: $2.79
  10. Size #7.5 Rubber Stopper

    Size #7.5 Rubber Stopper

    • Top diameter 1-9/16". Bottom diameter 1-1/4".
    • Made of pharmaceutical-grade, tan color rubber.
    • Available both with and without holes.
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    Price: $3.05

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