A historic slip on rubber duckbill check valve, the TF-2 duckbill check valve was Tideflex Technologies' first valve created in the 1980s. The TF-2 slip on duckbill check valve comes in a variety of elastomer choices, and is engineered specifically as a backflow prevention valve.


  • Reliable backflow prevention
  • 100% elastomer construction eliminates maintenance
  • Will not corrode, warp or freeze open or shut
  • 1”-2” Cracking Pressure, Low Headloss
  • Curved Bill enhances sealing around debris
  • Custom built for each application based on pressure and flow conditions
  • Available in diameters from 1/2" (12mm) to 102” (2550mm)

Materials of Construction

  • Elastomer
  • Compression Clamps
    • 304 Stainless Steel (Std.)
    • 316 Stainless Steel
    • Special Alloys Available


The TF-2 was the first duckbill check valve introduced by Red Valve Company. The TF-2 was developed based on a United States EPA grant in the 1980’s to overcome excessive costs in maintenance and replacement of non-performing flap gates. Hundreds of thousands of Tideflex have been installed since then providing reliable backflow prevention.

The TF-2 design has been enhanced by the TF-1, flat-bottom, Duckbill Check Valve. The TF-1 requires minimal bottom clearance and the inherent geometry and construction of the TF-1 yields a stronger, more durable check valve.

The Tideflex Duckbill Check Valve is a revolutionary design for backflow prevention. Tideflex Valves are a one-piece rubber matrix of numerous natural and synthetic elastomers and ply reinforcement, similar in construction to a truck tire.

Tideflex are cost-effective because they do not need periodic maintenance or repair to keep them operational and they have a 30 year operational life span. Tideflex operate using line pressure and back pressure to open and close so no outside energy source is required.

The valve has an extremely low cracking pressure so the valve self-draining which eliminates standing water and maximises storage volume in the upstream pipe. Tideflex Valves have low headloss, they do not rust or corrode and are not affected by UV so performance and reliability is constant thru the life of the valve.

The flexibility of the Tideflex allows the valve to compress around trapped solids providing a much better seal than flap gates, as confirmed by the USEPA. With the development of the patented curved bill, sealing capabilities are even further improved because the curve bill is more flexible than the rest of the valve and therefore compress more around solids.

The TF-2 installs by slipping over the end of an exposed piece of pipe, and is fastened with compression clamps. The inside diameter of the TF-2’s cuff is fabricated to exactly match the outside diameter of the pipe.

The original Tideflex design, the TF-2, has a flare on the top and bottom of the valve. It has been superseded by the TF-1 as Red Valve's standard design, but remains available for customers who desire it for aesthetic reasons or space limitations.

The TF-2 can also be installed on the OD of elliptical pipe and many arch pipes. Tideflex Technologies also offers a thimble plate option allowing the slip-on TF-2 to be installed directly to a headwall or seawall. For higher back pressure ratings or to lower headloss while maintaining back pressure ratings, the Saddle Support Technology (SST) can be used in conjunction with the Series TF-2.

If you require any assistance or more information please contact us by phone on 01603 488700 or by email sales@althon.co.uk

Tideflex Check Valve Series TF-2

    Brochures, Datasheets and Installation Instructions for Tideflex Check Valve Series TF-2