Johnson Pump 28503 Cartridge Aerator Pump 500 GPH 12V Straight Intake 3/4"
32-2850
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Johnson Pump 500 GPH Aerator (28503)
Premium 12V Cartridge Livewell Pump - Straight Intake
The Johnson Pump 28503 (also known as 32-2850) is the industry standard for reliable livewell aeration. Designed for both fresh and saltwater environments, this cartridge-style aerator pump allows for easy maintenance or motor upgrades without the need to disconnect plumbing or remove the entire pump housing. The water-cooled motor and 316 stainless steel shaft ensure longevity in demanding marine conditions.
Key Features
- β **Replaceable Motor Cartridge:** Swap motors in seconds
- β **Anti-Airlock Design:** Prevents air binding in the system
- β **Marine-Grade Build:** 316 Stainless Steel shaft
- β **Energy Efficient:** Low amp draw for battery preservation
Technical Specs
| Flow Rate: | 500 GPH (32 L/min) |
| Voltage: | 12V DC |
| Amperage: | 2.5A |
| Fuse Size: | 5A |
| Hose Connection: | 3/4" (19mm) |
| Intake Style: | Straight |
Compatibility / Fitment Guide
| System Type | Application | Notes |
|---|---|---|
| Marine Livewells | Baitwell Aeration | Standard 3/4" plumbing fitment |
| Fishing Boats | Replacement Cartridge Units | Compatible with most 500 GPH Johnson housings |
| OEM Replacement | Direct fit for SPX/Johnson | Meets ISO 8849 Marine standards |
OEM Cross Reference
| Johnson Pump (Global) | 28503 |
| Johnson Pump (UK/Europe) | 32-2850 / 32-2870 |
| UPC Code | 729321285032 |
| Manufacturer | SPX FLOW Johnson Pump Marine |
Questions & Answers
Is this a genuine original part?
Yes, this is a genuine Johnson Pump product from SPX FLOW, manufactured to strict marine safety and performance standards.
Can I replace the motor without changing the plumbing?
Yes. This pump features a cartridge design that allows the motor unit to be removed and replaced without disturbing the hose connections or the hull mount.
What is the difference between this and the 90-degree version?
This model features a straight intake configuration. If your plumbing requires a right-angle entry from the bottom of the livewell or transom, you would require the 90-degree model (MPN 38503).
Note: Please verify your original part number or hose size (3/4") before purchasing. Available for dispatch from 4boats.co.uk.
For the products under Β£150 the shipping is Β£6.99.
Free delivery for most items over Β£150.
