ProFlex™ Styles 711/731

The Proco Style 711/731 ProFlex™ check valves are engineered for installation on pre-existing pipe lines such as manholes, outfalls and vaults where the outfall invert of the pipe is close to the floor of the manhole or outfall. When a new installation is being designed, the 711731 valves can be engineered into the pipe layout with little concern for outfall clearance due to its “low slope” design.

The new Style 711/731 check valves allow the valves to be installed without any costly and labor-intensive changes to the existing structure. The 711/731 is engineered to crack open at 1-2” of head pressure and with its unique engineered sloping bottom, the valve ensures zero potential for standing water. With its all elastomer design, the valve can be installed without concern for the future seizing or rusting which can cause premature failure and maintenance issues.


How Does it Work?

The advantage to the Style 711/731 is the sloping bottom which has been developed to offset the issues commonly affiliated with other flat bottom valves which often entrap solids and flows due to its design. The 711/731 has been carefully designed to prevent this issue and has a minimal slope which allows complete drainage yet still allows easy installs on minimal clearance areas.

The Style 711/731 has been engineered to allow a full port which is important in dealing with headloss and jet velocities. The valve is manufactured with 100% algae and barnacle resistant rubber and is also 100% fire resistant.


  • Unique bottom slope design ensures 100% drainage
  • Installs in flat outfall designs
  • Available in both flanged and slip-on design
  • An excellent choice for manholes and outfall installation
  • Ensures sealing from rubbish and small solids


Materials of Construction

Neoprene, ANSI/NSF-61 certified product elastomers, EPDM and other elastomers available. Please contact Proco.

Mounting Clamps or Retaining Rings

304 or 316 Stainless Steel

For more information about the features and benefits of the Proco ProFlex™ Styles 711 and 731, download this PDF information sheet

ProFlex™ 711/731 Informational Animation

All Proco Series 700 ProFlex™ rubber check valves are available in a wide selection of back pressure capabilities and elastomers, including NSF/ANSI 61 certified material. Because of the wide array of available configurations, there’s sure to be a Series 700 ProFlex™ valve to suit your application.

Proco ProFlex™ check valves won’t freeze or deform, and they function solely on the inlet and back pressure which are present in each unique situation.

Each valve is designed by some of the most experienced rubber technicians in the industry, and are carefully constructed using the finest engineered materials available. All of our Series 700 ProFlex™ valves are precisely manufactured to ensure proper operation, and will provide years of unhindered, trouble-free service.

Available Styles & Materials

For Specific Elastomer Recommendations, See: PROCO "Chemical To Elastomer Guide"
PROCO Material Code Cover1,2 Elastomer Tube Elastomer Maximum Operating Temp. °F (°C) Branding Label Color F.S.A. Material Class
BB Chlorobutyl Chlorobutyl 250 °F (121°C) STD. III
EE EPDM EPDM 250 °F (121°C) STD. III
NH Neoprene CSM 212 °F (100°C) STD. II
NN Neoprene Neoprene 225 °F (107°C) STD. II
NN-NSF61 Neoprene Neoprene 225 °F (107°C) STD. II
NR Neoprene Natural Rubber 180 °F (82°C) STD. I


ProFlexTM is a trademark of PROCO Products, Inc.
All products are reinforced with polyester tire cord.
1.  Check Valve “cover” can be CSM coated on special order.
2.  Styles with Neoprene covers meet all requirements of U.S.C.G.
3.  NSF/ANSI Standard 61 certified materials available upon request.

Due to the wide array of uses for the Proco ProFlex™ Styles 711 and 731 rubber check valves, it is recommended that you download our Series 700 Brochure to review the Frequently Asked Questions. This will ensure that you choose the proper style of check valve for your specific application.

If additional information is needed, please contact us directly.