Same character as backflow prevention valve DN 100, additional it has a special overflow with odour trap and 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 funcionality 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.