The NDS Dura Flo CV Check Valve Dripline combines the best of Dura Flo PC with a check valve. The combination brings the next level of water conservation to your irrigation project. The dripper features a check valve with anti-siphon capabilities preventing low emitter drainage on shut down and eliminates back-siphonage at each emitter. This combination maximizes water efficiency by minimizing water loss and protecting each emitter from clogging and root intrusion. Dura Flo CV is the only product offering this level of efficiency and protection in an all-in-one solution for drip line applications. Each roll is shrink-wrapped for easy handling and to insure the roll stays together as product is dispensed. Tubing can be easily unwound from center of coil while shrink wrap maintains the remaining coil in place.