 These airports continue to use stainless steel slot drainage both airside and landside for surface water drainage requirements.Following the use of slot drainage at airports, the manufacturers began engineering slot drainage for other types of construction project, including ports, docks, industrial areas, motorways, roads, car parks and urban developments.Differing sizes and load ratings variations of the original slot drain product now exist, manufactured by Gatic and a handful of other manufacturers, most notably Halfords and Aco technologies.