Model NF8: Especially made for wall and yard hydrants. Permits manual draining for freezing conditions. NF8 has a shearing head set screw, which locks it to the hydrant to prevent tampering.

Anti-Siphon Vacuum Breakers designed to prevent back-siphonage of contaminated water into safe water supply.

Note: Always check local plumbing codes for required level of back flow protection; valves below may not meet local codes. See RPZ Valves at left for highest level of back flow protection.