Transport water to plants efficiently with 1/2 in. supply tubing (0.620 in. ID X 0.710 in. OD). Connect tubing to create a main supply line or attach smaller tubing to create a feeder line that delivers water to a low-flow, drip-watering device. The green stripe on the tubing can be used to differentiate and identify different zones when there is more than one in an irrigation system. Unlike other manufacturers, NDS poly tubing is engineered in layers for durability using 100% virgin content for its outer and inner layers, with a middle layer of recycled content.