The Slot Drain features a 25mm top opening with 20 slots encompassing a 3-meter span, which then drains into a 90mm Stormwater pipe. Be sure to remove the insert used in concrete installation once the concrete has fully set to ensure optimal drainage. The Slot Drain is primarily designed for storm-water run-off, but it is also suitable for surface water drainage in various areas such as garages, pools, driveways, paths, pedestrian and paved areas, courtyards, sporting areas and garden edges.