The 3P backwater flap DN 100 prevents wastewater from entering the rainwater storage tank in the event of backwater. It is suitable for installation in DN 100 pipes and consists of a commercially available backwater protection from the wastewater sector. The backwater flap allows the water flow to flow in one direction only. If the water flows in the opposite direction, the flap closes and prevents dirt from entering the rainwater storage tank. The flap is fitted with a special seal.
