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.
