The DB-4 Inline Duckbill Check Valve using a clamp is to be fitted inside your pipe to prevent back flow. This is an insertable rubber check valve. The end is secured in place by tightening the internal expanding clamp. Additional bolts can be installed in the pre-existing holes in the clamp, drilling will be required. Suited to low back pressure applications.

Choosing a Curved Bill or Straight Bill:

Curved Bill model - provides 50% more sealing area compared to the straight bill ended duckbill check valve, enabling a better tighter seal when debris are present. Does require a slightly higher cracking pressure to open the valve compared to the Straight Bill model.

- Straight Bill model - opens with minimal cracking pressure, if debris are present there is a high chance it will effect sealing performance.


Measure the internal diameter of your pipe to select the size. The inline duckbill check valve is sized depending on the internal diameter of the pipe.

- Available in a range of rubber materials such as Neoprene, NBR, EPDM, Viton - contact us for a quote.

- 12 months warranty on manufacturing defects only.

Brand Defender Valves Inline Duckbill Check Valve - EPDM
Data Sheet

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