Skip to main content


WaStop® Inline Check valve

The WaStop Inline Check Valve immediately protects people and properties from flooding and backflow, odor and pests in the stormwater and sewer systems. 

WaStop® Inline Check valve
Technical specifications

WaStop is a membrane non-return valve that is normally closed. WaStop comprises two main components: a conical membrane and a valve unit. The solution is extremely adaptable as regards installation options. It can be installed both horizontally and vertically, and can be installed for use in both directions. Common installations: 

  • Inlets and outlets
  • Existing pipes
  • Pumping stations
  • In chambers and manholes

The product is available as standard for pipes from NPS 3" to NPS 84". We adapt the solution to the customer's requirements. 


Download technical specification
Drawings and technical specifications

We at Wapro believe in opportunities. By being an open organization, we can learn from our customers and share our experiences. Below you will find all the information about our products and also other useful and interesting information. Contact us if you are missing something.

Nominal Pipe Size
Valve body length
8.30 in
Valve body diameter
3.80 in
Host pipe min.diameter
3.90 in
Host pipe max.diameter
4.20 in
1.80 lb
Max flow (velocity)
6.60 fps
Max flow (volumetric)
253.60 gpm
Max back pressure
16.40 ft2O
Horizontal closing pressure
2.80 inH2O
Horizontal opening pressure
7.50 inH2O
Submerged opening pressure
5.70 inH2O
Submerged closing pressure
0.80 inH2O
Vertical opening pressure
8.70 inH2O
Vertical closing pressure
3.10 inH2O
Max flow (velocity)
6.60 fps
Max flow (volumetric)
253.60 gpm
Sealed for one-sided pressure


Feel free to watch our videos below to get an idea of how the WaStop is installed.

For more videos, please watch our YouTube channel

Kerry Olsson

Does this sound interesting?

Contact Kerry Olsson for more information
Kerry Olsson
Sales Manager

Area of use

Contact our experts