Works as a supply line to an emitter or a feeder line branching off larger tubing or pipe. Another use is to punch emitters directly into the side of the tubing to deliver water along the way. The 1/2" tubing features an outside diameter (OD) of 0.62" & internal diameter (ID) of 0.52" While other manufacturers use blended recycled material to construct their entire tubing, Raindrip poly tubing has a unique layering method using 100% virgin content for the outer and inner layers for a more durable product, and middle layer of recycled content.