• Stainless steel for corrosion resistance
• Designed for minimum head loss
• 150 pound ANSI/AWWA CL D flanged
• Less shutoffs

This 4 IN double check detector backflow preventer assembly prevents the backflow of fire protection system substances from being pumped or siphoned into the potable water supply. It consists of a compact construction and short lay length, ideal for retrofit installations. It features a lightweight stainless steel body, thermoplastic and stainless steel check valves, and low head loss. It can be installed in a horizontal or vertical flow-up position. It is designed for installation on applications identified by local authorities as non-health hazard, such as on fire protection systems. It has a gallons per minute meter. The maximum working pressure is 175 psi (12.06 bar).