This high-quality water reservoir plug is specially designed for use in test tubes when keeping ant colonies. The material forms a reliable water reservoir and offers a modern alternative to traditional cotton wool.

Thanks to its fine structure, the plug releases moisture evenly and stays firmly in place. Additionally, it is less prone to mold than ordinary cotton wool, and ants are less likely to pull the material apart. As a result, the test tube remains cleaner, more stable, and usable for longer.

Ideal for queens, young colonies, and ant keepers who want to give their setup a professional and durable upgrade.

Suitable for test tubes with an inner diameter of 14-16 mm