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Frog flaps for use in sewer pipes

  • Backwater valves
  • Frog flaps
Frog flaps from the manufacturer for use in sewer pipes to protect against the ingress of vermin and small animals from sewer systems

Frog flaps made by Lasso Technik Inc.

Animals such as vermin or frogs that enter drain pipes can become a problem for water quality. With our Stop Silent Light frog flap, the penetration of small animals into your sewage system is reliably and permanently eliminated. The simple installation in the industrial as well as in the private waste water sector is quickly installed inside the pipe. Furthermore, the frog flap is a reliable backwater protection for waste water with a backpressure of up to 0.5 bar. This frog flap prevents an unpleasant stench which the waste water produces. Here the waste water pipe is sealed airtight.

Advantages of the Stop Silent Light Frog Flap

  • Simple and quick installation
  • High longevity
  • Airtight odour damper
  • Reliable backwater protection in the event of flooding
  • Suitable for faecal and rainwater

Is your piping system protected against the infiltration of small animals?

Small animals entering tube systems can quickly become an annoying problem. To solve it reliably and permanently, a Stop Silent Light check valve can be fixed in the tube.

Because of this problem, it is also the quality of the water that is deteriorating, which can have unpleasant consequences for humans.
With the “frog flap” function, it is impossible for small animals to infiltrate the piping systems, which guarantees a perfect water condition.
The Stop Silent Light system fits into the tube and is barely visible after installation.

A simple operation that ensures continuous performance.

Due to a slight accumulation of water, a small pressure is exerted on the membrane, which then opens upwards. When the flow is stopped, the sealing lip closes and the valve closes.

Case study of Bivio, Graubünden

After the new intake was commissioned to supply Bivio, it was noted that amphibians and other vermin could infiltrate the piping from the outside.

In order to solve this problem as quickly as possible, our Stop Silent Light backstop protection systems has been installed.

The installation is characterized by quick fixing and friction clamping inside the tube. Within minutes, the valves were installed and ready for use.

Functionality of our frog flaps

Our anti-frog shutters also serve as protection against water backflow. The accumulation of waste water exerts pressure on the membrane so that the sealing lip opens upwards. In doing so, the valve releases the waste water flow. If the flow stops, the sealing lip folds down again and closes the nose flap. In order to prevent sewage gases from escaping from the cellars, the valve is always airtight.

Installation sizes of the frog flaps

Our Stop Silent Light frog flaps are available in the following sizes.

Inner pipe diameter:

  • 80 mm
  • 100 mm
  • 110 mm
  • 125 mm
  • 150 mm
  • 200 mm
  • 250 mm
  • 300 mm
  • Larger on request

Application examples of our frog flaps

Our frog flaps have a wide range of applications.

  • sewer systems
  • inspection shafts
  • sewer pipes
  • sewerage connections
  • Flood protection during floods
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Daniel Rohrer
CEO - Lasso Technik AG
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Lasso Technik AG
Niklaus von Flüe-Strasse 33
4059 Basel
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+41 61 331 40 90
lasso@lasso.ch
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