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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4-Pack Drilled #6 Rubber Stoppers

Product ID: 488187855

Details

Material
Rubber
Brand
Dishwasher safe?
Yes
Number of items
4

🌿Premium natural rubber for durability

🍺Perfect fit for 64 oz to 6.5 gal vessels

🛠️Precision drilled for airlocks

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Description

🍻 Lock in freshness, unlock your craft!

CRAFT YOUR OWN BREW - Essential accessory for homebrewers crafting beer, wine, mead, and more
BULK PACK CONVENIENCE - 4-pack keeps your fermentation projects fully stocked and ready
DURABLE NATURAL RUBBER - Premium quality material ensures long-lasting airtight performance
SEAMLESS FERMENTATION SEAL - Drilled stopper fits standard airlocks for flawless fermentation control
VERSATILE VESSEL COMPATIBILITY - Ideal for growlers, jugs, and carboys from 64 oz to 6.5 gallons

This 4-pack of #6 rubber stoppers by Fermentaholics features precision-drilled holes for standard airlocks, fitting a range of fermentation vessels from 64 oz growlers to 6.5 gallon carboys. Made from premium natural rubber, these durable stoppers provide an airtight seal essential for brewing beer, wine, mead, and other fermented creations.

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Brand	Fermentaholics
Model Number	VES287
Product Dimensions	2.9 x 2.9 x 2.54 cm; 68 g
Material	Rubber
Item Weight	68 g

4-Pack Drilled #6 Rubber Stoppers

Details

Details

Description

Specifications

Common Questions