Water rows of plants evenly with the 18mm Dura Flo™ Dripline (0.600 in. ID X 0.700 in. OD). This dripperline features 1.0 GPH pressure-compensating (PC) emitters spaced 18 in. apart to distribute a consistent flow of water even if the water pressure were to change. The self-cleaning emitters flush out particles in the water to help prevent clogging. Tubing is made of polyethylene, and emitters are made of polyethylene and silicone, all treated with UV inhibitors.