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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Fermentation TPE Rubber Stoppers 4-Pack – Drilled Bungs for Airlocks (#6.5)

Fermentation TPE Rubber Stoppers 4-Pack – Drilled Bungs for Airlocks (#6.5)

Product ID: 411761073

Details

Brand
Color
White
Material
Plastic
Product Dimensions
1.2"W x 1"H
Shape
Cylindrical

🍺Fits multiple fermentation vessels

♻️Durable, recyclable TPE material

🛠️Precision-drilled for perfect airlock fit

€ 26.44

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🍻 Seal your brew, unlock your craft!

COMPACT LIGHTWEIGHT DESIGN - Easy to handle and store, these 4-pack stoppers keep your fermentation process seamless and mess-free.
VERSATILE FIT FOR EVERY BREW - Designed to snugly fit a wide range of brewing vessels, making it your all-in-one fermentation companion.
PERFECT AIRLOCK COMPATIBILITY - Drilled stoppers engineered to securely fit standard airlocks, ensuring flawless fermentation control.
PREMIUM ECO FRIENDLY MATERIAL - Crafted from durable, recyclable TPE rubber for long-lasting use and sustainable brewing.
ESSENTIAL FOR HOMEBREW MASTERY - A must-have tool for crafting beer, wine, mead, kombucha, and more with professional precision.

Fermentation TPE Rubber Stoppers 4-Pack are precision-drilled, recyclable thermoplastic elastomer bungs designed to fit standard airlocks and a variety of brewing vessels. Ideal for homebrewers, these durable stoppers ensure airtight fermentation for beer, wine, mead, kombucha, and more, combining eco-friendly materials with versatile functionality.

Specifications

ASIN	B09L1NWYJD
Best Sellers Rank	#76,705 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #60 in Lab Rubber Stoppers
Brand Name	Fermentaholics
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (629)
Item Dimensions W x H	1.2"W x 1"H
Item Weight	2.88 ounces
Manufacturer	Fermentaholics
Material Type	Plastic
Model Number	DrilledBungsStopper - P
Number of Items	1
Number of Packs	4
Shape	Cylindrical
Unit Count	4 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

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€ 26.44

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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