MarineWarehouse/Mayfair-Cartridge-Bilge-Pump-Original__20073.1722347515

Johnson Pump Cartridge Bilge Pump - MW

Name: Johnson Pump Cartridge Bilge Pump - MW
Brand: Johnson Pump (MW)
SKU: MAY-32903.1
Availability: InStock

SKU MAY-32903.1 MFR Johnson Pump (MW)

Express

Toronto, ON Vancouver, BC NJ, Warehouse FL, Warehouse

"Express" items are automated and typically shipped out the next available business day and delivered within 4 days.

In Stock

Purchasing Code Required

To order this product online, please contact us with the quantity you need and your ZIP / postal code to receive your purchasing code. Some locations are restricted at this time.

Request Purchasing Code

Already have a code? Enter it below to unlock pricing and purchasing.

Ask a question about this product

Back to: Johnson Bilge Pumps

Mayfair Replacement Johnson Pump Cartridge Bilge Pump

Keep your bilge dry with this easy-to-service Johnson Pump Cartridge Bilge Pump, compatible with Mayfair models. The durable thermoplastic housing and stainless steel motor shaft resist corrosion, while the integrated motor/impeller design reduces loose parts. Cartridge removal is quick, just lift, twist, and pull. This water-cooled, energy-efficient pump runs quietly and supports float switches for automatic operation. Compliant with ISO 8849 marine standards, it’s a dependable choice for boaters looking for reliable bilge performance and minimal maintenance effort.

Johnson Pump Cartridge Bilge Pump Features:

12V cartridge bilge pump with high impact housing.
Easy installation and increased longevity.
Corrosion, chemical and fuel resistant.
Permanent magnet motor along with permanent lubrication.
T-Slot for easy float switch attachment
Includes both a straight and 90 degree smooth elbow Dura-Port

Specifications:

Outer diameter discharge port: 3/4"
Fuse Size: 5 Amp
Voltage: 12V DC
Wire Size: 16 GA

Part No.	Capacity 3 ft head	Capacity straight	Amperage
32503	33 l/min - 535 GPH	40 l/min - 630 GPH	2.5 A
32507	44 l/min - 700 GPH	50 l/min - 800 GPH	3 A
32903	50 l/min - 800 GPH	63 l/min - 1000 GPH	3.2 A

Click to Download the Johnson Pump Cartridge Bilge Pump User Manual

Frequently Asked Questions

What is the Mayfair Replacement Johnson Pump Cartridge Bilge Pump designed for?

This Johnson Pump Cartridge Bilge Pump is designed to keep bilge areas dry while serving as a replacement option for compatible Mayfair models. Its cartridge-style design makes servicing easier and helps reduce maintenance time.

What pump capacities are available for this bilge pump?

This pump is available in three options: Part 32503 rated at 535 GPH at 3 ft head and 630 GPH straight, Part 32507 rated at 700 GPH at 3 ft head and 800 GPH straight, and Part 32903 rated at 800 GPH at 3 ft head and 1000 GPH straight.

What features make this bilge pump easy to service?

This bilge pump features a cartridge design with integrated motor and impeller components, so there are fewer loose parts to manage. The cartridge can be removed quickly by lifting, twisting, and pulling, which makes cleaning and service easier.

Is this bilge pump durable enough for marine use?

Yes. The pump uses a high-impact thermoplastic housing and a stainless steel motor shaft that resist corrosion, chemicals, and fuel exposure. It is also water-cooled and compliant with ISO 8849 marine standards.