Mason Jar Fermentation Lids with Airlock System (4-Pack)

This fermentation lid and airlock set turns standard mason jars into a complete fermentation setup, making it simple to ferment vegetables, fruits, and more at home. Many home fermenters improvise with cloths or loosely fitted lids, risking spoilage or mess — this set solves that with a stable airlock system designed to manage gas release throughout fermentation. It's built for the kitchen counter, pantry, or office, anywhere a batch of kimchi, sauerkraut, or pickles might be quietly fermenting. It's designed for home fermenting enthusiasts making kimchi, hot sauce, ginger carrots, sauerkraut, pickles, yogurt, or wine.

Key Features & Benefits

• Compatible with Standard Mason Jars: Fits regular mason jars (7cm/2.76 inch diameter), which means no need for specialty fermentation vessels.

• Stable Airlock System: Features an 11.5cm (4.53 inch) tall airlock that manages gas release throughout fermentation, which means steady, controlled fermentation without the guesswork.

• Effortless Installation: Fits into the lid without damaging the silicone grommet, which means simple setup for daily use.

• Wide Fermentation Range: Works for fruits, vegetables, yogurt, and wine, which means one set covers a variety of homemade fermented foods.

• Space-Friendly Design: Suits homes, offices, and studies, which means it's easy to fit fermentation into small spaces.

Technical Specifications

What's Included

• Fermentation Lids x4 (jars not included)

• Airlocks x4

Care & Usage

• Fit the airlock into the lid carefully to avoid damaging the silicone grommet.

• Allow for 1–3mm of measurement variance due to manual production.

• Monitor fermentation progress through the airlock's bubbling activity as a general guide.

Frequently Asked Questions

1. Do these lids fit standard mason jars?
A: Yes — with a 7cm (2.76 inch) diameter, they are compatible with standard regular-mouth mason jars.

2. What are the exact dimensions of the airlock and lid?
A: The metal lid has a diameter of 7cm (2.76 in), and the plastic airlock stands 11.5cm (4.53 in) tall when inserted.

3. Are jars included with this set?
A: No — this set includes 4 fermentation lids and 4 airlocks only; jars are not included.

4. What foods can I ferment with this set?
A: It's suited to fruits, vegetables, yogurt, wine, and foods like kimchi, sauerkraut, pickles, and hot sauce.

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