These high capacity bilge pumps feature very heavy duty construction for both commercial and pleasure boat use. They are known for their trouble-free operation and reliability. "Automatic" models pump when water is sensed in the bilge, and do not require a separate float switch. Features: This pump has a 1-1/2" discharge outlet. Fully automated bilge pump with computerized operation. High capacity pump for larger vessels. Quick release inlet strainer allows rapid cleaning. Motor rated for 2500-hour life. Ignition protected. No need for a separate float switch. Third wire for manual override or warning light. Specifications: Output: Up to 220 litres/minute (48 gallons/minute). Max. recommended discharge head 4m. Type: 3700 GPH Automatic Bilge Pump Fuse Size: 25 amp Connections: For 38mm (1.5") bore hose. Discharge Port:1-1/2" Voltage:12V Weight:5.5 lb Dimensions:8-1/4"H x 4-7/8" Dia. Capacity:3700 gph Current Draw:15.5A Sensing Current Draw:0.76 Ah per Day Model:55S