750 GPH Ultima Combo Pump Ultima Combo Pumps take the most reliable switch in the marine industry today pared with the most robust cartridge pump around and you have the Ultima Combo Pump series. Available in 500 GPH - 1250 GPH. Reliable switch activation, replaceable cartridge design, pre wired for auto operation as well as manual override and with Dura Port discharge fittings in 3/4 in. Item: 709401 BS: X03365 OEM: 04704