Transport water directly to your plants with 1/4 in. distribution tubing. Branch off the main line to create a feeder line to supply water to a low-flow, drip-watering device, or use as a main line in a smaller drip system. The 1/4 in. tubing, also known as micro tubing or spaghetti tubing, has a 0.250 in. outside diameter (OD) and 0.170 in. internal diameter (ID). Unlike other manufacturers that use blended recycled material for their tubing, Raindrip poly tubing has an innovative layering method, using 100% virgin content for the outer and inner layers for a more durable product, and a middle layer of recycled content.