Outdoor Water Solutions ARL0020 100-Feet of 3/8-Inch Polytubing Air Line 100-feet roll of 3/8" polytubing air line Moves with the turn of a windmill Aeration systems can be placed up to 1000 from the pond when connected by an air line. ARL0020 100-feet roll of 3/8" polytubing air line Moves with the turn of a windmill Aeration systems can be placed up to 1000 from the pond when connected by an air line.