Sealion's New Aquarium Air Vent Product (Air Stone) Air Vent Air Vent is your typical air stone but with additional features and functionality. Air Vent can be adjusted to various lengths. Each Air Vent package contains 6 interchangeable pieces that can connect up to 24" / 60 cm long. Because each package contains interchangeable parts, multiple packages can be purchased to create any desirable length. For example, 2 packages contain enough parts to create a 4 feet long Air Vent! Unlike standard air stones, Sealion's Air Vent has a longer product lifespan. Made of durable plastics, Air Vent's surface material prevents residue build-up and algae growth. You no longer have to repurchase air stones that fail in performance after several months of use due to algae build-up. A simple clean or rinse of Air Vent will remove any residue that prevents your product from maximum performance. We do recommend a 3W air pump or stronger for one package, and a 5W air pump or stronger for anything more than two packages. Advantages Adjustable length Interchangeable parts Longer lifespan Even air distribution Curtain bubble effect Easy set up