Airline Tubing 30 feet - Tubing AIR LINE Co2 Hose Aquarium Pump Air Stone Airline Tubing x 30 feet (9 Metres) 6mm (1/4") - Standard Airline Tubing Size. High Quality Silicone Tube Tubing This very flexible quality airline will fit all air pumps and fittings with standard 4mm outlets. MADE IN TAIWAN