Bilge Pump12V or 24V, w/Straight hose adaptor18040: 500GPH, 19mm hose #50/CTN18041: 700GPH, 19mm hose #50/CTN18042: 1500GPH, 31.8mm hose #20/CTN18043: 1800GPH, 31.8mm hose #20/CTN18044: 2000GPH, 31.8mm hose #20/CTN