Hydro Flow®, Manufactured by Netafim. Techline® CV Drip tubing is manufactured with flexible UV resistant tubing from post-consumer recycled polyethylene. Techline® CV Dripline is the most advanced dripper line available. Techline® CV’s Check Valve feature keeps water from draining out of the dripline after a zone shut-downs. Techline® CV tubing is available in a 17 mm internal diameter measurement for large on-surface/sub surface systems with flow rates from 0.26 GPH – 0.9 GPH. Available in three convenient emitter spacing configurations, including 12, 18 and 24 inch. Use our Hydro Flow® by Netafim dripline fittings to maximize your systems performance and reliability.