Netafim 19953-000214 TLCV0025 Techline® CV 17mm Blank Tubing with 250' Coil - Techline® CV is manufactured with post-consumer recycled polyethylene. Techline® CV Dripline has the most technologically advanced dripper available. It flushes debris as it is detected, throughout operation, ensuring uninterrupted emitter operation. Techline® CV’s Check Valve feature keeps water from draining out of the dripline after zone shut-down.