OVERVIEW: The Flexicraft Rubber Duckbill check valves are an efficient and economical way to control back pressure from sewage treatment plants, outfalls, and tidal operations, and serve other applications as well. They are extremely tough, and require no maintenance or any assistance to operate, and offer quiet operation and low opening pressure.

The Flexicraft Duckbills are available in several styles, including Series CPF for flanging directly to pipes, storm water headwalls, and Series CPO for direct clamping. CPI mounts between existing flanges in piping systems, and Series CPJ flanges into systems with a full metal body jacket.

Step up to the quality Flexicraft Rubber Duckbill check valves to replace maintenance problem flap type check valves that may seize, rust, or bind with obstructions.


  • Maintenance free and reliable
  • Prevents backflow
  • WIll seal around solids
  • Tough enough for abrasive slurries
  • Cost effective
  • Quiet operation
  • Available in a variety of materials
  • Low head loss


  • Storm Water Outfall/Overflow
  • Submerged Outfall Diffuser
  • Sewer Interceptors
  • Wet/Dry Wells
  • Scrubber Systems


Duckbill Rubber Check Valve