Get the best of water efficiency and emitter protection with the 17mm Dura Flo™ Check Valve Dripline (0.560 in. ID X 0.660 in. OD). The check valve design allows for lower opening pressures to enable longer run lengths, which can reduce the amount of installation materials and labor. It also prevents low emitter drainage on shut down to minimize water loss. The dripline contains 0.6 GPH emitters spaced 18 in. apart; each emitter is designed with 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.