What is the physical size???

These are not "ideal" for all 5gallon water jugs! Does not fit Primo 5 gallon walmart jugs! Get a smaller size for them!

What OD tubing will work best to fit snug on the center hole? 3/8 or 5/16?

Thanks for asking. 3/8in OD tubing fits in the hole but may be a bit loose. Therefore, 7/16in OD tubing will provide a tight seal despite taking some effort to squeeze in.

does this fit a gallon carboy?

No. You will want a universal or 6.5 stopper for a one gallon jug.

What is the hole diameter in the stopper

The stoppers I received had holes approximately 3/8 inch in diameter.

Carboy Stopper 10 Rubber Bung For Beer Wine And Mead

Description

🍻 Seal your brew like a pro—no leaks, no worries!

VERSATILE COMPATIBILITY - Optimized for 3, 5, 6, and 6.5-gallon glass carboys—ideal for homebrewing, winemaking, and cider crafting.
TRUSTED QUALITY SUPPORT - FastRack’s commitment means if your order isn’t perfect, they’ll make it right—brewing peace of mind included.
DURABLE FOOD SAFE MATERIAL - Crafted from BPA-free, lab-grade natural rubber built to withstand heat and wear for long-term use.
LEAK RESISTANT TAPERED DESIGN - Snug tapered shape with curved lip guarantees an airtight, slip-free seal every time.
PRECISION DRILLED FOR PERFECT FIT - 3/8" center hole engineered for standard fermentation airlocks ensures seamless integration.

The FastRack Drilled Rubber Stopper (#10, 3-pack) is a premium, BPA-free natural rubber bung designed with a precise 3/8" hole to fit standard fermentation airlocks. Its tapered, leak-resistant design with a curved lip ensures a secure seal for 3 to 6.5-gallon glass carboys, making it an essential tool for homebrewers and fermentation enthusiasts seeking durability and airtight performance.

Reviews

S**N

Great price

Great quality, works as designed, fits the 6 gallon plastic carboy

10.02.2026

B**R

Great fit

Very good exactly what I ordered

6.02.2026

V**Y

Works great

Excellent fit for my five gallon water jugs

10.12.2025

S**D

Hole for bubbler too small

The quality is great but the size of the hole where the bubbler goes is way too small. I am just going to drill it out to make it bigger.

9.02.2021

J**E

This fits the big plastic water jugs 6 gallon

Just the rite fit

21.11.2025

V**E

Fits your 5-6 gallon Carboy.

Nice quality rubber plug with the correct size whole to add your own airlock. Perfect for the larger carboys.

14.07.2025

N**A

They were not pre-drilled

Whatever product I happened to get it was not pre drilled stoppers and not made out of regular rubber. Stopper were made from some white material that started to crumble. I needed those for a batch a fresh grape juice I just received and had no time to order new ones and no nearby wine supply store to buy them at, so I kept those and drilled my own holes but ended up throwing them out after getting new ones. One of the stoppers started to disintegrate most likely from the fumes of wine and little white crumbs started falling into the carboy. Stay away!!

10.11.2022

A**L

Great product

Fast shipping

18.08.2025

T**A

Work as intended.

Size is right. Work as intended.

12.11.2025

N**R

tapon de buena calidad

el caucho del que estan hechos es super resistente lastima que no es de la medida de los garrafones de 10L queda un poco mas ancho

11.05.2026

B**Y

They are nice

They fit tight

11.05.2026

G**M

I required one stopper to replace one in our fountain which was leaking water.

Only one needed, but cost wasn’t too extreme and maybe in a few years I’ll require another one if I ca find out where I put them by then. Lol. It would be nice if the stopper was ready cut, as rather tricky cutting into this dense rubber. All in all things went well and the birds are happy to have a secondary place to drink and bathe.

30.05.2023

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16917CFA

Duties & taxes included

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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Great price for an authentic product. Fast international shipping too!

3 weeks ago

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Carboy Stopper | #10 Rubber Bung for Beer, Wine & Mead Brewing | 3 Pack

Description

Specifications

Reviews

Common Questions