The check valve that is installed in the twinkling of an eye.

Protect your property, basement or street from flooding and smells.


Key Benefits

  • Quick & easy to install and retrofit

  • Unobtrusive - does not protrude

  • Fits into angled pipes

  • Always closed & active against flooding

  • Airtight odour barrier

  • No moving parts or electronics to fail

  • DN100 - DN150 standard sizes

  • Designed for 5m back pressure

Reliable Backflow Prevention In Building Drainage

Developed by the Swiss company Lasso Technik AG, the Stop Silent Light valve sets new standards with its record-breaking fast installation and its reliable backflow prevention. It’s light-weight simple design means that the valve can be easily installed into existing pipes. Once the valve is screwed into place, the smooth rubber membrane is the only moving part. This means that the Stop Silent Light valve is durable and maintenance-free.

Besides backflow prevention, the Stop Silent Light valve acts as a barrier to stop the movement of rodents and insects. It’s airtight seal also prevents smells from exiting the drainage system and causing a nuisance.


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The Stop Silent Light® expander clamp can be operated from both sides and allows installation in the inlet or outlet of the control shaft. The “Stop Silent Light” check valve can either be installed in existing drainpipes or in control shafts.

In the case of an inlet and an outlet, Stop Silent Light® can be installed in the outlet. With this installation, the control shaft serves as a reservoir for self-contained water during the backflow. If the pipes and rainwater enter the control shaft, the pipe should be secured which should prevent the exit in the basement.


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Due to a small build-up, a small pressure is exerted on the diaphragm, which then opens upwards. If the flow stops, the sealing lip restores and closes the valve. In back pressure, the rubber membrane is filled and pressed against the pipe wall.

This function makes the gas movement impossible and helps to let the stench of the channel gases escape in the basement.

Contact MeasurIT today to find out how the Stop Silent Light valve can enhance your drainage design tomorrow.