Rain Bird® XFS-CV Dripline with a heavy-duty 4.3 psi check valve for on-surface and sub-surface applications adds a valuable member to the Rain Bird XF Series of Dripline. The XFS-CV is the most effective dripline in the industry and is ideal for areas where no other dripline will work. When used in applications where elevation changes exist, the patent-pending check valve keeps the dripline charged, holding 10 feet of hold back - the highest holdback in the industry. Rain Bird's XFS-CV offers better uniformity and helps to prevent over-watering at the low-point in the zone, avoiding puddling and water draining from the dripline. It accepts Rain Bird Easy Fit Compression Fittings, XF Dripline Barbed Insert Fittings and other 17 mm barbed insert fittings. XFS-CV Sub-Surface Dripline emitters are protected from root intrusion by Rain Bird’s patent-pending Copper Shield™ Technology resulting in a system that does not require maintenance or replacement of chemicals to prevent root intrusion. With a pure copper chip inside every emitter, XFS-CV Dripline also offers the industry's most effective root intrusion protection. Rain Bird’s low-profile emitter design reduces in-line pressure loss, allowing longer lateral runs, simplifying design and reducing installation time. Variety of standard emitter flow rates, emitter spacing and coil lengths provide design flexibility for sub-surface and on-surface areas with or without elevation changes. Through the use of a proprietary tubing material, the XFS-CV Dripline with heavy-duty check valve is the most flexible dripline tubing in the industry, making it the easiest dripline to design with and install.