Hunter Copper Dripline (HDL-COP) is designed to reduce root intrusion and provides an efficient, cost-effective solution for underground and overhead microirrigation. This innovative product offers three sturdy lines of defense to keep roots out for reliable long-term performance. 1. Copper reinforced drippers 2. Slow-draining check valve 3. Root-resistant design In addition, the anti-siphon emitter prevents infiltration of debris when the controller is shut off, eliminating the need for a vent valve.