Purchase a backflow device with Union Ball Valve ends for easy installation and un-installation to prepare for the winter.
MasterSeries ½ 850U Double Check Valve Assemblies with Union End Ball Valves are designed to prevent the backflow of pollutants that are objectionable but not toxic, from entering into the potable water supply. They feature a bronze body and union threaded ball valve end connections. Maximum Working Pressure: 175psi (12.1 bar). The FEBCO Series 850U Double Check Valve Assemblies are designed for non-health hazard applications. End Connections ½ NPT ANSI/ASME B1.20.1.Pressure - Temperature