is the hole perfectly centered?and what ios the size?

The hole is perfectly centered and is 9.6 mm or .378" wide

How do you stop them from slipping out on their own?

I found that putting a couple inches of paper towel over the bottom not only keep the stopper from slipping out.. it also adds a bit more protection from things entering the hole while your unaware. I've just did 4 gallons of grapes with blueberries.. the meter read just shy of a desert wine.. it turned out wonderfully light and easy to drink. THE MAX

Will these fit a 5 gallon plastic water jug used for drinking water dispenser?

If you need to cap 5 gallon drinking water jugs, you may be looking for this type of product instead (5 Gallon Water Jug Cap) https://www.amazon.com/dp/B0B3QXM4JG

what is the diameter of the hole?

3/8th inch. It matches all standard fermenter airlocks.

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Description

🍺 Unleash Your Inner Brewmaster!

EASY TO USE - Drilled design allows for effortless airlock attachment, making fermentation a breeze.
DURABLE LONG LASTING - Crafted from premium food-grade rubber, these stoppers are built to withstand the test of time.
HOMEBREWERS MUST HAVE - Essential for every DIY enthusiast, making your fermentation process seamless and enjoyable.
VERSATILE COMPATIBILITY - Designed to fit a variety of brewing vessels, ensuring you can ferment your favorites with ease.
PERFECT FOR ALL FERMENTS - Ideal for beer, wine, mead, cider, and even sauerkraut—unleash your inner artisan!

This 4-pack of #6 drilled rubber stoppers is designed for homebrewers and DIY fermenters, providing a reliable fit for various brewing vessels. Made from durable food-grade rubber, these stoppers ensure a long-lasting and effective fermentation process for a wide range of beverages and foods.

Reviews

J**M

Work as intended

Have bought these twice. Good quality, have zero complaints about these. Had to do measurements to make sure I bought the right size. Airlock fits tight and secure tightly in the carboy. Have noticed if the inside rim or the rubber is wet they tend to slip out of the carboy. Can be solved with making sure those are dry or taking a rubber band and wrapping around the finger loop and over top of the stopper.They are a little pricey in my opinion but should last a lifetime.

30.04.2025

G**D

Easy to Drill Hole

I needed to center a shaft inside a tube in order to pour a polymer sleve on it. These were easy to drill to the right size and worked perfectly.

15.03.2025

A**R

one good hole

these fit my big carboys and the hole is perfect for my tubing i use for the bubblers

3.01.2025

D**D

fit the need well

Work as planned

28.05.2025

I**H

Helpful

Help me find the perfect size for my jugs.

19.01.2025

L**W

Fits different sizes

Using it for fermentation in a fermenter

16.01.2025

A**O

Product is fine, but it didn't meet my needs

I bought these for a different purpose than intended. Unfortunately, it didn't meet my needs and I returned them. The return process was quick and easy. I love Kohl's drop off.

1.11.2024

M**M

Nice Size Selection

These plugs have many good uses. Nice that there is a pack of varied sizes available.

24.10.2024

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