Danner 12035 3/4-Inch by 50-Foot Black Standard Flexible Pond Tubing Pondmaster Standard Black Tubing 3/4inx50ft Smooth, black PVC tubing 3/4" ID by 50 ft Perfect for many pond, aquarium, fountain and water garden features This product is made in China 3/4-inch internal diameter. 50-foot Roll Individually package Kink resistant Prevents the formation of algae