B&K ProLine 104-515 Anti-Siphon Frost-Free Sillcock is an outdoor faucet that uses frost-free design and an anti-siphon feature to protect indoor plumbing from freezing and backflow. It measures 8 inches in length, positioning the valve inside the heated space for added protection. The model provides dual connection options—a 1/2" male connection and a 1/2" solder connection—so it can be hooked to either threaded or sweat copper supply lines. This sillcock is well-suited for exterior water service on residential or light commercial installations where frost protection and anti-siphon compliance are desired.
