Attwood Heavy-Duty Bilge Pump 1700 Series - 12V - 1700 GPH [4730-4]Heavy Duty Bilge Pump 1700 Series Part #: 4730 4 Heavy Duty Bilge Pumps integrate the highest quality bearings, brushes, alloys and magnets designed to withstand extreme usage cycles. Pump all employs an exclusive shaft and motor compartment, reducing wear and significantly extending pump life. Advanced resin compositions incorporated in exterior to resist chemicals such as engine oil, aggressive detergents and hose plasticizers. Attwood's Heavy Duty