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Rubber Check valves are a cost effective mechanism to prevent the back flow of fluids and gases. There are various types available on the market, including ball and flap type check valves however, our rubber check valves are specifically designed to be durable and effective, reducing the likelihood of common maintenance problems. They are a fully passive device requiring neither maintenance nor any sources of outside power or manual assistance to operate.




The Series 700 ProFlex™ Rubber Check Valves from Proco Products, Inc.  are specifically designed for use in sewage treatment plants, outfalls, and tidal operations. They’re a cost-effective solution for controlling back pressures, and are a fully passive flow device, requiring no maintenance, no outside power sources or manual assistance to operate.

The Series 700 ProFlex™ rubber check valves are recommended as direct replacements for ineffective, maintenance-ridden flap type check valves, which are commonly known to seize, rust, or bind in unwanted positions. The Series 700 ProFlex™ rubber duckbill check valves provide backflow protection from occurrences including:

  • Sewage slurries
  • Outfalls to ocean fronts from heavy rainfall activity
  • Land erosion due to back flow conditions
  • Invasion of saltwater to freshwater pond

*All check valves have been fully tested at an accredited flow laboratory and flow charts are available upon request.