Hydroponic Growth Tubes, used. Had been used for lettuce and greens. These are nft type tubes, nutrient film technique. Most tubes are about 10 feet 6 inches in length. We have over 1,000 tubes available. Also available are flats, trays, and humidity domes for starting plants, as well as pumps, return gutters, polypipe, fittings and packaging. We have retired from production. Price is negotiable.