Amazon.com : Penn-Plax Standard Airline Tubing for Aquariums – Clear and Flexible – Resists Kinking – Safe for Freshwater and Saltwater Fish Tanks – 25 Feet : Aquarium Air Pump Accessories : Pet Supplies
PENN PLAX Standard Airline Tubing Air Pump Accessories, 75 Feet (25 ft x 3)" - Walmart.com
Amazon.com : Penn-Plax Standard Airline Tubing for Aquariums – Clear and Flexible – Resists Kinking – Safe for Freshwater and Saltwater Fish Tanks – 25 Feet : Aquarium Air Pump Accessories : Pet Supplies