• Glass U Tube joint for silicone tubing.
• 20 mm size suitable for rimless aquariums and most standard aquarium rims.
• Great for use with CO₂ injection systems or bubblers.

The 20 mm glass U Tube allows you to easily run airline (preferably silicone) for CO₂ or for general air supply over the rim of the aquarium without bending or creasing. Made of strong clear glass, which minimizes visibility of tubing.

Compatible with 6 mm (1/4") - Standard Airline Tubing.