what size of hole do these fit?

I don't know, but they're the standard size for the pre moulded holes in standard rubber bungs. I don't have one to hand but I'd estimate about 10mm in diameter. If you have a solid rubber bung, you'd be able to drill it to suit.

what do airlocks achieve?

Airlocks allow the carbon dioxide created as a byproduct of fermentation to escape from the fermentation vessel, without allowing the air from the outside to enter the vessel, spoiling the product. The airlocks are filled with water and the pressure inside the vessel is great than outside as the Co2 is created and this bubbles through the water to escape.

Hi if i shape the bung to fit can these be used with a 25 ltr bucket?

Hi Yes this is what i do for the initial fermentation

Are these to fit demijohns?

The bungs that are supplied with the airlocks will fit into 1 gallon glass demijohns. The airlocks can be pushed into the grommets of 1 gallon plastic demijohns.

2 X Bubbler Airlocks With Rubber Bungs For Homebrew

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Description

🍺 Brew Like a Pro, Seal Like a Boss!

PROTECTIVE RED DUST CAPS - Keep your fermentation environment clean and dust-free with vibrant red caps.
LIGHTWEIGHT COMPACT DESIGN - At just 100g and compact dimensions, these airlocks are easy to handle and store.
SECURE SEAL WITH RUBBER BUNGS - Durable rubber bungs ensure airtight sealing, preserving your brew’s integrity.
PERFECT FIT FOR YOUR FERMENTATION - Seamlessly fits glass demijohns and 5-gallon wine fermenters for hassle-free brewing.
DUAL AIRLOCKS FOR DOUBLE THE CONTROL - Two airlocks included to manage fermentation with precision and reduce contamination risk.

This set includes 2 high-quality bubbler airlocks with matching rubber bungs and red dust caps, designed to fit standard glass demijohns and 5-gallon wine fermenters. Lightweight and durable, they provide an airtight seal to ensure optimal fermentation while protecting your brew from contaminants.

Specifications

ASIN	B00MPTQGRU
Best Sellers Rank	639,607 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 77 in Fermentation Airlocks
Brand	ALSTUNICO
Customer Reviews	4.6 4.6 out of 5 stars (705)
Date First Available	14 Aug. 2014
Guaranteed software updates until	unknown
Item Weight	100 g
Material	Rubber
Model Number	A
Product Dimensions	15 x 20 x 3 cm; 100 g

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S$25

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2 x Bubbler Airlocks with Rubber Bungs for Homebrew

Description

Specifications

Common Questions