This 12 inch double check detector backflow preventer assembly is designed to prevent the reverse flow of fire protection substances and water of non-potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements.

It is ideal for protection at cross-connections identified as non-health hazards such as on fire protection systems and from other contaminants found at the service line entrance. This compact modular design with a single access cover for easy maintenance is approved for horizontal and vertical flow up installation.

Features

• Cam-Check Assembly valve provides low head loss.
• Short lay length is ideally suited for retrofit installations.
• Stainless steel body is half the weight of competitive designs reducing installation and shipping cost.
• Stainless steel construction provides long term corrosion protection and maximum strength.
• Single top access cover with two-bolt grooved style coupling for ease of maintenance.
• No special tools required for servicing.
• Compact construction allows for smaller vaults and enclosures.
• Furnished with a 5/8" x 3/4" bronze meter (gpm or cfm) for the bypass.
• Detects underground leaks and unauthorized water use.
• May be installed horizontal or vertical "flow up" position (ASSE Only).
• Includes an integrated supervisory switch (UL Certified, Safety Signaling, Control No. 3L38) as an option on each gate valve of the OS&Y model.
• Consists of two independently operating, spring loaded check valves.
• Includes domestic outside stem and yoke resilient seated gate valves.
• Bypass assembly with gallons per minute meter and four test cocks.

A 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. Before installing standard material product, consult your local water authority, building and plumbing codes.