Transport water directly to plants with 1/4 in. distribution tubing (0.160 in. ID X 0.220 in. OD). Attach tubing to the main supply line 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.