The WaBack non-return chamber is a tried-and-tested product that provides immediate and automatic protection against backflow. The product is usually used as protection against basement flooding, and is fitted to service pipes and pipe networks. Used against overload and flooding in drains and as protection against backflow of surface water and waste water. The product is used to advantage in extremely polluted water, and can thus be used in both sewer and stormwater systems. The flow area is completely open, to ensure blockages are prevented. Technical specification Nominal diameter DN/OD 200 (NPS/OD 8) Weight 26 kg (57.3 lb) Chamber diameter (CØ) 600 mm (23.6 in) Dimension 200 mm (7.9 in) L 990 mm (39 in) Riser diameter (RØ) 600 mm (23.6 in) Min. invert-ground (min. I-G) 650 mm (25.6 in) Closing head 145 mm HO (5.7 inh2o) Pipe connection 200 PE Watertightness EN 13564 Bracket 316L stainless steel Chamber Polyethylene (PE) Damper EPDM Fasteners mtrl. 316L stainless steel Float Polyethylene (PE) Foam Seal Pe-Foam O-ring EPDM Sliding Plate PVC Rubber joint EPDM Product sheet (PDF) Technical specification (PDF) Dimensional drawing (PDF)