Ensure proper operation of air-driven aquarium devices with budget-friendly tubing. Lee's Flexible Standard Airline Tubing is clear, top quality aquarium tubing perfect for your aeration needs. Clear airline tubing is virtually invisible in the aquarium and fits aquarium air pumps with standard fittings (3/16" ID). Markings at every foot allow easy measurement. Great for airstones, bubble wands, or for use in drip acclimation. Bulk spool available for fish rooms and multiple aquarium setups.