<b>★ Feature:</b><br> Attached to sill cocks, valves, and hydrants with Male hose thread outlet. For indoor or outdoor use. <br> Designed to prevent dangerous back siphonage and back flow into a potable water supply. <br> Furnished with break-a-way lock screw if vandal-resistant installation is desired. For nonfreezing areas only.<br> Designed to protect hose connections from contamination where temperatures do not get below freezing. <br> Outlet side of vacuum breaker has a manual drain release of check valve to allow complete draining of valve, but must be operated manually after hose is disconnected to prevent valve from freezing. <br> <br> <br> <b>★ Package include: </b> 2 PCS Vacuum Breaker <br> 2 PCS extra red washers. <br>