Transport water to plants effectively with 1/2 in. supply tubing (0.600 in. ID X 0.700 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. 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.