Johnson Ultima Combo Automatic Bilge Pump L450 L550 L650 L750 12V 24V SPX Flow
10-1045
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Johnson Ultima Combo Bilge Pump
L450 UC • L550 UC • L650 UC • L750 UC
The Johnson Ultima Combo series represents the pinnacle of compact bilge pump technology. By combining the legendary Cartridge Bilge Pump with the solid-state Ultima Switch, Johnson Pump Marine has created an all-in-one automatic solution that requires no external float switch. Using patented Mirus field effect detector cells, this pump senses water levels digitally—meaning no moving parts to jam, corrode, or fail.
Key Features
- ✔ No Moving Parts: Digital Ultima switch prevents clogging
- ✔ Dura-Port Fittings: Straight & 90° elbows included
- ✔ Easy Maintenance: Removable motor cartridge
- ✔ Eco-Friendly: Mercury-free sensing technology
- ✔ Check Valve: Removable valve included to prevent backflow
Technical Specs
| Voltage: | 12V or 24V DC |
| Shaft: | SS2343 Stainless Steel |
| Auto-On Level: | 50mm (2") |
| Auto-Off Level: | 20mm (3/4") |
| Certification: | ISO 8849 Marine |
Performance Guide
| Model | Flow (Straight) | Flow (1m Head) | Amps | Hose Size |
|---|---|---|---|---|
| L450 UC | 49 LPM / 778 GPH | 38 LPM | 2.5A | 19mm (3/4") |
| L550 UC | 56 LPM / 884 GPH | 45 LPM | 3.0A | 19mm (3/4") |
| L650 UC | 61 LPM / 972 GPH | 53 LPM | 3.2A | 19mm (3/4") |
| L750 UC | 73 LPM / 1150 GPH | 60 LPM | 3.0A | 28mm (1-1/8") |
OEM Cross Reference
| Model ID | Johnson Part Number |
|---|---|
| L450 UC 12V | 32-1450UC-01 / 10-1045 |
| L550 UC 12V | 32-1550UC-01 / 10-1055 |
| L650 UC 12V | 32-1650UC-01 / 10-1065 |
| L750 UC 12V | 32-1750UC-01 / 10-1075 |
| L750 UC 24V | 32-1750UC-02 / 10-1076 |
Questions & Answers
Is this a genuine original part?
Yes, this is a genuine Johnson Pump (SPX FLOW) Marine product. It is a professional-grade automatic bilge solution used by major boat manufacturers worldwide.
Does it require a separate float switch?
No. The "Combo" name refers to the fact that the Ultima electronic switch is pre-integrated into the pump body. It is a 3-wire device that allows for both fully automatic and manual override operation.
Will oil in the bilge water affect the switch?
The Ultima field-effect detector cells are totally sealed and not affected by oil, fuel, or foreign debris, making them significantly more reliable than standard float switches in messy bilges.
Note: Please verify your required GPH capacity and hose diameter against the specs above. For technical support, please contact the 4boats.co.uk team.
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