Reduce the costs of materials and installation with the 18mm Dura Flo™ Check Valve Dripline (0.600 in. ID X 0.700 in. OD). The dripperline features a check valve that's engineered for lower opening pressures so larger sections can be installed before a valve is necessary. Longer run lengths require fewer connections and help make installation quick and efficient. The check valve also prevents low emitter drainage on shut down to minimize water loss. The dripline houses 0.9 GPH emitters spaced 12 in. apart; emitters feature an anti-siphon feature to eliminate back-siphonage and prevent clogging. The pressure-compensating dripperline delivers a steady, uniform amount of water even if there are of changes in pressure, elevation, or length of dripline used. Tubing is made of polyethylene, emitters are made of polyethylene and silicone, all treated with UV inhibitors.