This 8 inch Lead Free double check detector backflow preventer assembly, Series LF757NDCDA, is designed to prevent the backflow of non-health hazard pollutants that are objectionable but not toxic from entering the potable water supply system. It is suitable for continuous pressure service, protecting against both backpressure and backsiphonage. This assembly is primarily used on fire sprinkler lines when it is necessary to monitor unauthorized use of water.

Features

• Lead Free construction ensures the wetted surface contacted by consumable water contains less than 0.25% of lead by weight.
• Extremely compact design, 70% lighter than traditional designs.
• Housing and sleeve constructed from 304 (Schedule 40) stainless steel.
• Groove fittings allow integral pipeline adjustment.
• Unique tri-link spring check design provides the lowest pressure loss.
• Unmatched ease of serviceability with removable and serviceable tri-link checks without special tools.
• Equipped with UL/FM outside stem and yoke resilient seated gate valves (OSY shutoffs).
• May be used for horizontal, vertical, or N pattern installations.
• Features a bypass assembly with a gallons per minute meter (also registers in cubic measurement) for monitoring water flow.
• Includes replaceable check disc rubber.
• Consists of two independent tri-link check modules, a single housing, sleeve access port, four test cocks, and two drip tight shutoff valves.