3P Backflow Prevention Valve DUO DN100


Operating principle

The backflow flap only allows the water to flow in one direction.

A hinge joint ensures that the rainwater tank overflows during normal operation.

If water were to flow in the opposite direction, the flap closes and prevents dirt from flowing into the rainwater tank.

The flap is also provided with a special seal.

Same character as backflow prevention valve DN 100, additional it has a special overflow with odour trap and the suction of the surface water.

The 3P Backflow Prevention duo is installed inside the rainwater tank, between the filter and the tank wall overflow outlet. Therefore unnecessary installation time and fittings are omitted.

Because of the firm height difference inside the overflow siphon, installation errors can be avoided and the functionality is secured. Overflow siphon with a lateral suction of the surface water on both sides inside the rainwater tank. No entry of rodents. Connection for supporting tube available.

Technical Data

Dimensions: 850 mm x 480 mm

Material: Polyethylene

Weight: ca. 1,1 kg


Backwater is when wastewater from the sewer network is pushed back into the connected underground pipes. Large amounts of precipitation, but also overloading of the sewer system, unplanned discharges, operational failures of pumps or narrowed cross-sections can be the causes.

The municipalities are not liable for damage caused by sewer backwater. They therefore recommend or prescribe backflow protection for buildings that are located in endangered sewer sections.

Since backflow damage is usually not covered by household or building insurance, the homeowner can take out additional insurance. But even here there can be restrictions.

The 3P backflow flap prevents dirty water from entering the rainwater storage tank in the event of backflow. It is suitable for installation in DN 100 pipes.

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