Ultima Combo bilge pump is equipped with the non-clogging electronic switch Ultima Switch for automatic operation. The 500 GPH -1000 GPH pumps has easy-to-install Dura-Port discharge ports to eliminate stress cracking caused by overtightened hose clamps. The pumps will be delivered including both a straight and a 90° smooth elbow Dura-Port as well as a removable check valve. Voltage12V DC as well as 24V DC for 1000 GPH and 1250 GPH.