Keep your test tube colonies safe, secure, and stationary with this thoughtfully engineered Test Tube Stopper, originally designed by Antheap and expertly adapted by Daniel Onneweer for Esthetic Ants' 16x150mm test tubes.
 
This stopper features a unique hexagonal outer shape that prevents your test tube from rolling—perfect for both storage and active setups. It fits snugly and comes with a vented insert, providing essential airflow while keeping your ants securely inside.
 
Key Features:
Designed specifically for Esthetic Ants 16x150mm test tubes
Anti-roll hexagonal design prevents unwanted movement
Includes a vented stopper for proper ventilation
Originally created by Antheap, adapted by Daniel Onneweer
Durable, reusable, and escape-proof
 
Whether you're storing queens or maintaining a small test tube colony, this stopper is a must-have for any serious antkeeper.