Johnson Pump Automatic Bilge Pump

Mayfair Replacement Automatic Bilge Pump by Johnson Pump

Stay ahead of bilge buildup with this automatic Johnson blige pump, available in 500, 750, or 1000 GPH models. Smart sensors activate the pump when water levels rise, and a manual test button lets you check functionality on the spot. The twist-lock cartridge design makes cleaning or replacement quick and tool-free. Ready to handle saltwater and tough marine conditions, it installs easily and runs quietly to maintain onboard stability. With a 3-year warranty and self-regulating performance, it’s a reliable choice for keeping your bilge dry and your boat safe.

Direct replacement for older models of Mayfair Automatic Bilge Pumps with an Ultima Switch.

Features:

• Pre-configured with an electric Ultima Switch for automatic operation
• Extremely energy-efficient
• Water-cooled motor for long service intervals
• Compact, all-in-one motor/impeller unit with stainless steel shaft
• Easy-to-install Dura-Port discharge ports
• Includes both straight and 90° smooth elbow Dura-Port
• Meets international standard, ISO 8849 marine

Specifications:

• Dimensions: 4.41" Height x 4.25" Width x 3.35" Depth

Click to Download Johnson Pump Automatic Bilge Pump User Manual

Frequently Asked Questions

What is the Mayfair Replacement Automatic Bilge Pump by Johnson Pump used for?

The Mayfair Replacement Automatic Bilge Pump by Johnson Pump is designed to automatically remove water from a boat's bilge. Its electric Ultima Switch activates the pump when water levels rise, while a manual test button allows functionality to be checked. It is available in 500, 750, and 1000 GPH configurations and is designed for marine conditions, including saltwater use.

Which Mayfair Automatic Bilge Pumps does this Johnson Pump replace?

This pump is a direct replacement for older Mayfair Automatic Bilge Pump models equipped with an Ultima Switch. Before purchasing, verify that your existing pump uses the Ultima Switch and that the selected model's voltage, connection size, and capacity match your boat's requirements.

What are the available capacity and electrical specifications for the Mayfair Replacement Automatic Bilge Pump?

The pump is offered in 500, 750, and 1000 GPH models, all operating at 12 V. The 500 GPH model draws 2.5 A, the 750 GPH model draws 3 A, and the 1000 GPH model draws 3.2 A. Each uses a 5 A fuse, 3/4" connection, and 16 GA wire size.

What discharge ports are included with the Johnson Pump Mayfair Replacement Automatic Bilge Pump?

The pump includes Dura-Port discharge ports along with both a straight and 90° smooth elbow Dura-Port. These options provide flexibility when connecting the bilge pump to the appropriate discharge setup. The pump has a 3/4" connection and measures 4.41" high x 4.25" wide x 3.35" deep.

How is the Mayfair Replacement Automatic Bilge Pump designed for marine use?

The Johnson Pump Mayfair replacement pump features a water-cooled motor, stainless steel shaft, and compact motor/impeller design. It is designed for saltwater and tough marine conditions and meets the international ISO 8849 marine standard. Follow the applicable equipment owner's manual and product instructions for installation and operation.

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