Series Cu7 Copper-Body Dual Check Valves prevent the reverse flow of polluted water from entering into the drinking water supply at the service entrance or at individual outlets. It consists of a lead-free, copper, poppet-type body construction, that minimizes pressure drop and provides smooth flow characteristics. Series Cu7 straight-line design is ideal for use in non-health hazard residential water system containment and continuous pressure applications. It can be installed in a vertical or horizontal position and is furnished with double unions for ease of installation and repair. Check with local inspection authorities for installation requirements. Minimum Working Pressure: 10psi (69 kPa), Maximum Working Pressure: 150psi (10.34 bar).