CEF 2-50378 Impeller Mercury Mariner 40-80HP Replaces 47-19453T
2-50378
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CEF 2-50378 Water Pump Impeller
Six-blade key-drive impeller | Replaces 47-19453T
The CEF 2-50378 is a six-blade, key-drive water pump impeller for selected Mercury and Mariner outboards. Correct cooling-water flow is essential to engine protection, making the impeller a critical routine-service component.
Key Features
- ✔ Genuine CEF-branded aftermarket impeller
- ✔ Six flexible blades for cooling-water delivery
- ✔ Key-drive centre hub
- ✔ Fits selected Mercury and Mariner outboard applications
- ✔ Cross-references Sierra 18-8900 and Mallory 9-45301
Technical Specs
| Brand | CEF |
| CEF part number | 2-50378 / 500378 |
| Blade count | 6 |
| Drive type | Key drive |
| Outside diameter | 78.2mm |
| Inside diameter | 19.25mm |
| Depth | 25.15mm |
Compatibility / Fitment Guide
Listed for selected Mercury and Mariner 40HP four-cylinder FourStroke/EFI and Jet models, 45HP Jet, 50HP four-cylinder FourStroke/EFI, 55HP three-cylinder, 60HP three- and four-cylinder/FourStroke/EFI, plus certain 80HP EFI FourStroke applications. Check the original impeller, gearcase type and engine serial-number-specific parts diagram before purchase.
Part Number Cross Reference
| CEF | 2-50378; 500378 |
| Mercury / Mariner | 47-19453T; 47-19453 |
| Sierra | 18-8900 |
| Mallory | 9-45301 |
This is a genuine CEF aftermarket replacement, not a genuine Mercury or Mariner component.
Questions & Answers
Is this a genuine Mercury impeller?
No. It is a genuine CEF aftermarket replacement.
Does it fit every 40–80HP Mercury or Mariner?
No. Fitment depends on the gearcase, model and serial number. Match the part reference and dimensions.
How many blades does it have?
The impeller has six blades and a key-drive hub.
What else should be inspected during replacement?
Inspect the key, wear plate, cup/housing, gaskets and seals, replacing any worn or damaged components.
Note: Impeller replacement requires correct blade orientation and water-pump assembly. Follow the engine workshop manual or use a qualified marine technician.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
