This Weighted Air Line Tubing is the highest quality product available on the market today. Fast and easy to install! Economy air line tubing will float if you don’t take the time and energy to weigh down the line with rocks or gravel. This weighted air line tubing immediately sinks to the bottom of the pond upon installation. Not only is this air line tubing UV tolerant but it is BLACK so it blends into the surroundings of the pond with out a care. This is the same airline tubing used in the field PROFESSIONALLY by The Pond Digger Construction Team.