Raw Water Pump – Fits Northern Lights 6KW and Under Series Generators (Replaces 25-12007, 145016820, 25-18305)
Raw Water Pump – Fits Northern Lights 6KW and Under Series Generators (Replaces 25-12007, 145016820, 25-18305) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Raw Water Pump – Fits Northern Lights 6KW and Under Series Generato...
Raw Water Pump – Fits Northern Lights 6KW and Under Series Generators (Replaces 25-12007, 145016820, 25-18305) is backordered and will ship as soon as it is back in stock.
Product Details
This is an aftermarket Raw Water Pump – Fits Northern Lights 6KW and Under Series Generators, including M643 and M673 series variants. It is engineered to meet or exceed OEM specifications for reliable cooling performance in marine environments.
It serves as a direct replacement for Northern Lights part numbers 25-12007, 145016820, and 25-18305, as well as Jabsco 30415-7001 and JMP JPR-NL08IH.
- Designed for direct, hassle-free installation.
- Constructed from marine-grade bronze for superior corrosion resistance.
- Features bidirectional rotation for flexible setup.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Northern Lights | 25-12007 |
| Northern Lights | 145016820 |
| Northern Lights | 25-18305 |
| Jabsco | 30415-7001 |
| JMP | JPR-NL08IH |
| Ancor | 298 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This pump is compatible with a range of Northern Lights generators.
| Brand | Model | OEM Part No. |
|---|---|---|
| Northern Lights | M643 | 25-12007 |
| Northern Lights | M643K | 25-12007 |
| Northern Lights | M643M | 25-12007 |
| Northern Lights | NL643 | 25-12007 |
| Northern Lights | M673 | 25-12007 |
| Northern Lights | M673D | 25-12007 |
| Northern Lights | M673L | 25-12007 |
| Northern Lights | M673L2 | 25-12007 |
| Northern Lights | M673L3 | 25-12007 |
| Northern Lights | M673LD2 | 25-12007 |
| Northern Lights | M673LD3 | 25-12007 |
| Northern Lights | NL673 | 25-12007 |
| Northern Lights | NL673L | 25-12007 |
| Northern Lights | NL673L2 | 25-12007 |
| Northern Lights | NL673L3 | 25-12007 |
Technical Specs
- Product Type
- Raw Water Pump
- Installation
- Direct replacement
- Connection
- 1/2" Hose
- Housing Material
- Bronze (Marine Grade)
- Housing Color
- Bronze
- Dimensions
- 110 × 117 × 81 mm (L×W×H)
- Weight
- 1.5 kg (3.3 lbs)
- Fitting Type
- Hose barb
- Warranty
- 1 Year (JMP replacement)
- Other Technical Attributes
- Bidirectional rotation (can turn right or left)
What’s in the Box
- 1 x Raw Water Pump (25-12007)
- 1 x O-Ring Mounting Gasket
Installation Notes
- Ensure the engine is completely cool and disconnect the battery.
- Close the seacock to stop water flow.
- Place a catch pan under the old pump to collect any residual coolant.
- Loosen the hose clamps and detach the inlet and outlet hoses from the pump.
- Unbolt and remove the old pump from its mounting bracket.
- Clean the mounting surface and inspect the hoses for wear or damage, replacing if necessary.
- Install the new O-ring gasket and mount the new pump.
- Reconnect the hoses and tighten the clamps securely.
- Re-open the seacock and reconnect the battery.
- Start the engine and check for leaks at all connections.
Troubleshooting & FAQ
Which generator models does this pump fit?
This pump is designed for Northern Lights 6KW and under series generators, including the M643, M673, NL643, and NL673 families and their variants. Please check the compatibility list for your exact model.
What are the signs of a failing raw water pump?
Common signs include engine overheating, visible water leaks from the pump housing or weep holes, reduced water flow from the exhaust, and unusual grinding or whining noises from the pump assembly.
Is this a self-priming pump?
Like most raw water pumps with flexible impellers, this unit is self-priming to a certain extent. However, it is always recommended to ensure the system is properly primed upon installation or after maintenance to prevent dry running, which can damage the impeller.
What is "bidirectional rotation"?
Bidirectional rotation means the pump can operate correctly whether the engine drive turns it clockwise or counter-clockwise, making it compatible with a wider range of engine configurations without modification.
How often should the impeller be replaced?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years, depending on usage hours and operating conditions (e.g., water quality).
Can I buy just the impeller or gasket?
This listing is for the complete pump assembly. While replacement impellers and gaskets are standard service parts, please check our other listings or contact us to inquire about their availability.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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