The Prier C-534 provides a year round source of water to areas of structures that are subject to freezing temperatures. The hydrant valve is connected to the supply piping in the heated portion of the structure, eliminating the possibility of freezing. To assure freeze protection, the hydrant will drain even with the hose attached & under pressure without sprayback! The C-534 combines Freezeless Hydrant features with self-draining, anti-siphon & two backflow check valves! The vacuum breaker/backflow preventer provides protection against cross-connection of the potable water supply, while venting to eliminate any vacuum. The C-534 has an extended vandal proof lockshield & is shipped with a loose key for operation. Upon closure the valve drains even with closed end hose attached. No special installation tools are required.