4mm In-Line Joiners for Aquarium Airline

For serious hobbyists, these high-quality in-line joiners are essential for reliable aquarium airline connections.

Key features include:

• Secure Fit: Extra-large barbs ensure the fittings lock tightly onto the airline for a secure connection.
• Durable Design: Reinforcement collars provide added strength and longevity.

These black airline fittings are designed for durability and precision, making them ideal for professional and hobbyist aquarium setups.