The Aqua One Air Line Soft Tubing is a flexible and durable PVC airline designed for connecting air pumps to airstones, ornaments, and other air-driven devices in aquariums. Its soft, kink-resistant construction ensures smooth and consistent airflow while reducing noise. Compatible with standard 4mm airline fittings, it is suitable for freshwater, tropical, and marine setups, providing a reliable and efficient solution for maintaining optimal oxygenation and aeration in your aquarium.