A gravity filling allows the highest flows. The user can then choose the most appropriate pump type for the discharge. JOSKIN offers various systems that can be placed on top or at the back of the tank: 6” flat flanges (150 mm squares), 8” flat flanges (200 mm squares) or 10” flat flanges (250 mm squares) with a choice of locations, upper manholes with a 600 mm diameter (or 520 mm in some cases) with hook or hinge closure, 500 x 600 mm bolted flanges, etc.