DIY bottle cap connector with 4 mm fittings – Artemia breeding accessory

This screw cap is compatible with standard PET bottles and is ideal for DIY projects such as homemade Artemia breeding systems or air-driven applications.

It features an integrated sealing gasket to ensure a secure and leak-proof fit, as well as two 4 mm hose connectors suitable for standard 4 mm air tubing.

Made from durable plastic, the cap is reusable, easy to clean and designed for long-term use. A practical solution for aquaristics, breeding setups and technical DIY projects.