The Watts Series LF909 Reduced Pressure Zone Backflow Preventer Assembly with flood sensor provides cross-connection control protection for potable water supplies, preventing reverse flow of polluted water caused by backsiphonage and/or backpressure. It is ideal for continuous pressure piping applications and at cross-connections identified as health hazards.

This 2 1/2 inch assembly features Lead Free* construction and is designed without shutoff valves.

Corrosion Protection

• Features ArmorTek® coating technology, a patented three-part advanced epoxy system.
• Engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrate.
• Coating is applied to both internal and external surfaces of the cast iron body.

Relief Valve Design

• Unique patented air-in/water-out relief valve design provides maximum discharge capacity during emergency conditions.
• Designed for superior performance when both checks are fouled under combined backsiphonage and backpressure.
• The relief valve is field reversible.

Flood Detection

• Includes a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve.
• The sensor relays a signal that triggers notification to facility personnel for corrective action, helping to limit flooding and costly damage.
• Alert features are activated with an add-on sensor connection kit, which is compatible with Building Management Systems (BMS) and cellular network communication.
• Without the connection kit, the sensor is a passive component with no communication capabilities.

Key Features

• Equipped with replaceable seats and stainless steel internal parts.
• Features captured spring check assemblies.
• Fused epoxy coated and lined checks enhance durability.
• Industrial-strength sensing hose included.
• No special tools are required for servicing.

*The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.