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Description
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.
Can this bilge pump be used with a float switch?
Yes. This pump includes a T-slot that makes it easier to attach a float switch for automatic operation.
California Residents: 
WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov
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