BASIC NECESSITY FOR AQUARISTS: As aquarists and fish-keeping hobbyists know, it’s always good to have extra airline tubing on hand. Our Deluxe 3/16” 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. FLEXIBLE & DURABLE: Made from durable silicone, our Deluxe 3/16” Airline Tubing is built to withstand wear and tear. The tubing’s flexibility makes it a breeze to work with. This tubing will never crack, harden, or kink. The light green hue also virtually disappears when in water. SAFE FOR FISH: Our Standard 3/16” Airline Tubing is made of fish-safe silicone, and can be used for both freshwater and saltwater tanks. MEASUREMENTS: Length = 8’ / Inner Diameter = 4 mm / Outer Diameter = 6 mm. SHOP PENN-PLAX FOR ALL YOUR PET’S NEEDS: PENN-PLAX is a manufacturer and distributor of top quality pet supplies, who specialize in creating excellent pet products for animals, both great and small.