Netafim Techline HCVXR-RW Dripline .77 GPH Flow, 12 Inch Emitter Spacing - 500 Foot CoilTechline HCVXR RW and RWP Designed for reclaimed water use, Techline HCVXR RW and RWP combine superior root intrusion protection, an anti siphon feature and high check valve. All the same features as Techline HCVXR dripline and easy to identify purple stripes designating its use with reclaimed (recycled) water. Techline HCVXR RWP is a solid purple color. HCVXR means High Check Valve Why Techline HCVXR RW and RWP? Long Lasting Protection Throughout the