Features as the 3P backwater flap DN 100, additionally special overflow with odour trap and suction of surface water. The 3P DUO backwater flap is installed between the filter and the overflow connection in the rainwater storage tank. This eliminates unnecessary installation time and fittings. The fixed height offset in the overflow siphon pre- vents installation errors and thus ensures function. Overflow siphon with a snorkel on both sides of the surface water in the rainwater storage tank, no passage for rodents.
Operating principle: Dirt particles that are lighter than water (e.g. pollen) slowly rise and float on the water surface. This floating layer is removed by the special shaped overflow siphon with skimmer effect. DN 50 connection pipe to use a HT pipe as a support pipe. Is supported on the rainwater storage wall. The overflow siphon is filled with water (odour trap). If the storage tank has a low water level the support helps to keep the overflow siphon in the correct position.
