Prier 1/2 In. SWT x 1/2 In. x 12 In. IPS Anti-Siphon Wall Hydrant is a reliable and efficient solution for outdoor water access while preventing zing and back-siphoning. This wall hydrant is designed to provide self-draining and frostproof functionality. It ensures protection against zing temperatures, which can cause outdoor hydrants to ze and burst pipes. By incorporating an anti-siphon feature, it also safeguards against undesirable back-siphoning, which can potentially contaminate the potable water system. Unlike some anti-siphon attachments that require manual draining to prevent zing, this wall hydrant has an integral anti-siphon design that is self-draining. This means it can effectively prevent zing and back-siphoning without the need for constant maintenance. Model Number: 478-12