Ideal for hydroponic and aquarium applications, this Polyethylene tubing is durable, flexible and easy to plumb. Aquatic Life Polyethylene Tubing 50 ft. x 1/4 inch. Ideal for hydroponic and aquarium applications. Available in 50 ft. lengths in Blue, Yellow and Red to make it easy to identify incoming water and waste water. Items 500297 (Blue), 500298 (Red), 500299 (Yellow).