BASIC NECESSITY FOR AQUARISTS: As aquarists and fish-keeping hobbyists know, it’s always good to have extra airline tubing on hand. Our Standard Airline Tubing offers a great solution for various aquarium airline needs, such as connecting an air pump to an air stone, an under-gravel filter, or an aquarium ornament. CLEAR, FLEXIBLE, AND DURABLE: Made from clear, flexible plastic, our Standard Airline Tubing is built to withstand wear and tear. The tubing’s flexibility makes it a breeze to work with. In addition to being resistant to kinking, it’s ultra-durable and should not crack or become brittle. For better connection to aquarium accessories, soak both ends in warm water for 30 seconds. SAFE FOR FISH: Our Standard Airline Tubing is made of fish-safe plastic, and can be used for both freshwater and saltwater tanks. MEASUREMENTS: Length 1m / Inner Diameter 4 mm / Outer Diameter 6 mm. AFTER SALES SERVICE: Free exchange or full money back within 30 days if you are not satisfied with Our Standard Airline Tubing. Feel free to contact us if you have any questions.