This Colt™ 4 inch reduced pressure detector backflow preventer assembly is designed to prevent the reverse flow of non-potable water and fire protection substances into the potable water supply. It is ideal for protecting drinking water from dangerous cross-connections caused by backsiphonage or backpressure, such as in fire sprinkler systems and industrial processing lines.

WARNING: It is illegal to use this product in any plumbing system providing water for human consumption, such as drinking or dishwashing, in the United States. Consult your local water authority, building, and plumbing codes before installing.

The C500 series includes a flood sensor on the relief valve to detect excessive water discharges. When activated by an add-on connection kit, the sensor relays alerts for potential flooding events.

Construction & Operation

• Features a 304 (Schedule 40) stainless steel housing and sleeve with groove end connections.
• Consists of two independent Link Check modules and a differential pressure relief valve.
• Includes two outside stem and yoke (OSY) resilient seated gate valves that provide drip-tight shutoff.
• Equipped with a gallon per minute meter for detecting leakage or unauthorized water use.
• Bottom-mounted cast stainless steel relief valve.
• Integrated supervisory switch on each gate valve (OSY model).

Key Features

• Extremely compact design, approximately 70% lighter than traditional designs.
• Patented link check for lowest pressure loss and unmatched ease of serviceability.
• Replaceable check disc rubber for simple maintenance.
• Flood sensor with SentryPlus Alert® technology for discharge detection.