Double Check Detector Backflow Preventer


Double Check Detector Backflow Preventer

The 350ADA Double Check Detector Backflow Preventer protects against both backsiphonage and backpressure in low health hazard, fire protection applications. Featuring a metered bypass system, the 350ADA efficiently detects leaks and any unauthorized water use. Its single access cover reduces downtime and added costs associated with maintenance and repairs. Lighter in weight than the 350DA Model, the 350ADA features a short lay-length for compact, versatile installation in horizontal or vertical positions, and is available in a variety of flanged, grooved, or grooved x flanged end connections.

  • Horizontal or vertical installation offers versatility and reduces installation time
  • Leak and unauthorized water use detection decreases costs over time
  • Patented Compound Check offers reliable performance and improved flow characteristics
  • Lack of threads or taps in cover and body reduces corrosion exposure
  • ASSE® Listed 1048
  • AWWA Compliant C510 (with gates only), and C550
  • CSA® Certified B64.5
  • UL® Classified
  • C-UL® Classified
  • FM® Approved

Backflow Attributes

  • Grooved for steel pipe, flanged
  • Epoxy coated ductile iron
  • 2-1/2"*, 3"* , 4", 6", 8", 10"

Cover used with RK6-LBF-VALVE-COVER.


#2 Seat Assembly Repair Kit, 6" 375ADA used with RK6-350-SEAT2-ASSY Kit Contains Seat Retainer #1 (x6).


Bypass Assembly used with RK6-350DA-BP-LM.


Main & Bypass Rubber Repair Kit 6" 350DA used with RK6-350DA. Kit Contains O-Ring, Check (x2), O-Ring, Poppet Bolt (x8), Seal Ring (x2), and Bypass Rubber Repair Kit.


Poppet Retainer Repair Kit, 2-1/2" - 4" 350A used with RK4-LBF-SEAL-RTNR. Kit Contains O-Ring, Poppet Bolt (x4), and Poppet Retainer.


Cover used with RK8-LBF-VALVE-COVER.


#1 Seat Assembly Repair Kit, 8" - 10" 350ADA used with RK8-350-SEAT1-ASSY. Kit Contains Seat Assembly, and #1 Poppet.


#2 Check Assembly Repair Kit, 8" 350ADA used with RK8-350DACK2. Kit Contains Seat Retainer #1 (x7), Bolt, Poppet Retainer (x6), Washer, Poppet Bolt (x6), O-Ring, Poppet Bolt (x6), Poppet Retainer, Seat Assembly, #2 Poppet, Washer, and Seat Retainer (x7).

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