ProLine Backflow Preventer-Vacuum Breaker is designed to be attached to sill cocks, valves, and hydrants with a male hose thread outlet, making it suitable for both indoor and outdoor use. This device effectively prevents dangerous back siphonage and backflow, ensuring your water supply remains uncontaminated. It comes with a break-away lock screw for vandal-resistant installation, i for added security. This product is intended for use in nonzing areas, protecting hose connections from contamination where temperatures stay above zing. The outlet side features a manual drain release for the check valve, allowing complete draining of the valve after the hose is disconnected to prevent zing. by I.A.P.M.O. and A.S.S.E., it is packaged individually with a display pack designed for peg hook hanging, making it convenient for retail presentation. Model Number: 108-904RP