Johnson Pumps 07503-00 Ultima Combo Automatic Bilge Pump GPH - 500 12V

The Johnson Pumps 07503-00 Ultima Combo is an automatic submersible bilge pump that combines proven cartridge bilge pump technology with the advanced Ultima electronic float switch for reliable, hands-free operation. Rated at 500 GPH, this 12-volt pump delivers efficient bilge water removal with an energy-efficient, water-cooled motor design.

Key Features:

• Patented Mirus field effect detector technology eliminates clogging and corrosion issues associated with traditional float switches
• Activates automatically when water reaches 2 inches deep, deactivates at 3/4 inch depth with an 8-second delay to prevent false starts
• Compact cartridge design allows motor/impeller replacement without removing entire pump from boat
• Dura-Port crack-resistant discharge ports withstand over-tightened hose clamps
• Includes both straight and 90-degree discharge port fittings plus removable check valve
• No tools required for maintenance—pump casing stays attached to boat and hoses during servicing
• Stainless steel shaft with thermoplastic pump body for durability
• Pre-wired for automatic operation with manual override capability
• CE approved and suitable for marine and RV applications

Specifications:

• Capacity: 500 GPH at 3-foot head, 630 GPH straight run
• Voltage: 12V DC
• Amperage: 2.5A (5A fuse recommended)
• Outlet Size: 3/4 inch
• Dimensions: 4.41" L x 4.25" W x 3.35" H
• Weight: 14.4 oz

The Ultima Switch features fully sealed solid-state electronics with no moving parts, no mercury, and detector cells that never contact water—ensuring long-term reliability in harsh marine environments.