It centralizes all drains (shower, sinks, kitchens, toilets etc.) to avoid bores in the hull. Universal model supplied without pump and automatic floar. It can be fitted with pumps: Rule/Jabsco/360/800/1000 GPH, Attwood V625/V750/V900, Europump 16.813.60, TMC 600GPH/500GPH/1000GPH, Seaworld 750GPH and floats Rule 35/35F, Attwood 4202, Seawoorld 40812.