Pond Boss® 1.5 in. ID corrugated tubing is flexible and strong for use with waterfall pumps. The tubing is 20 feet long, kink resistant, and safe for fish and plants. The black color blends in naturally with surroundings. Quality materials and accessories, like pond boss® 1.5 in. corrugated tubing, are critical for the adequate development and dependability of a pond and its components. Kink resistant tubing Blends in naturally with surroundings. Black color inhibits algae growth Dimensions: 3/4 in. ID x 20 ft. Safe for fish and plants.