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888.640.4791

Our offices are closed for Labor Day. Orders placed online will be processed on Tuesday 9/2/2025.

Our offices are closed for Labor Day. Orders placed online will be processed on Tuesday 9/2/2025.

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Northern Lights Heat Exchangers and Water Pumps for 673 Series Generators

Our broad selection of Northern Lights Heat Exchangers and Water Pumps are sure to help with your M673 Generator needs.

If you do not see the Northern Lights part you are looking for, please use our quote request form or call us at 888.687.0539: our knowledgeable inside sales staff will gladly assist you.

NL-052400400
Hassle-Free Return Item

MOUNTING O-RING - M643 / M643K / M643M / NL643 (SEA WATER PUMP)

$1.64

NL-145017390
Special Promotion item Hassle-Free Return Item

FRESH WATER PUMP - M643 / M643K / M643M / NL643 (MARINE)

$215.58

NL-145206320
Hassle-Free Return Item

THERMOSTAT - M643 / M643K / M643M / NL643 (167DEGF/75DEGC)

$59.44

NL-145336490
Hassle-Free Return Item

PULLEY - M643 / M643K / M643M / NL643 (FRESH WATER PUMP)

$76.21

NL-145536440
Hassle-Free Return Item

END CAP - M643 / M643K / M643M / NL643 (HEAT EXCHANGER)

$40.90

NL-145536461
Hassle-Free Return Item

RAW WATER PUMP DISCHARGE HOSE - M643 / M673

$57.71

NL-145996630
Hassle-Free Return Item

MOUNTING GASKET - M643 / M643K / M643M / NL643 (FRESH WATER PUMP)

$12.70

NL-145996640
Hassle-Free Return Item

BACK PLATE GASKET - M643 / M643K / M643M / NL643 (FRESH WATER PUMP)

$12.70

NL-145996740
Hassle-Free Return Item

GASKET - M673L / M673L2 / M673L3 / M673LD2 (THERMOSTAT HOUSING)

$4.40

NL-198217410
Hassle-Free Return Item

SPRING - M643 / M643K / M643M / NL643 (THERMOSTAT)

$24.26

NL-20-12003
Hassle-Free Return Item

HEAT EXCHANGER ELEMENT - M643 / M643K / M643M / NL643

$490.09

NL-20-12207
Hassle-Free Return Item

COOLANT FILLER NECK - M643 / M643K / M643M / NL643 (BRASS, 1-1/8")

$21.15

NL-21-12013
Hassle-Free Return Item

COOLANT FILLER CAP - M30C / M673 / L984 / M864K (7 PSI, DOUBLE SEAL)

$18.94

NL-25-12007
Hassle-Free Return Item

RAW WATER PUMP - M643 / M643K / M643M / NL643

$754.87

NL-25-12009
Hassle-Free Return Item

IMPELLER KIT - M643 / M643K / M643M / NL643 (WITH COVER GASKET & O-RING & SCREW)

From $50.73

NL-25-12010
Hassle-Free Return Item

REPAIR KIT - M643D (FOR RAW WATER PUMP 25-12007)

$247.70

NL-25-12013
Hassle-Free Return Item

RAW WATER PUMP END COVER - M673 / M673D (76 MM, 6 HOLES)

$32.44

NL-25-12026
Hassle-Free Return Item

SPACER - M643 / M643K / M643M / NL643 (SEA WATER PUMP)

$34.50

NL-25-12028
Hassle-Free Return Item

SEAL - M643 / M643K / M643M / NL643 (SEA WATER PUMP, LIP TYPE)

$26.34

NL-25-12029

SNAP RING - M643 / M643K / M643M / NL643 (SEA WATER PUMP, INTERNAL)

$21.14

NL-25-12066
Hassle-Free Return Item

MECHANICAL SEAL - M643 / M643K / M643M / NL643 (SEA WATER PUMP, GREEN)

$64.47

NL-25-18307

O-RING - M643 / M643K / M643M / NL643 (SEA WATER PUMP)

$0.56

NL-25-18322
Hassle-Free Return Item

BACK COVER GASKET - M643 / M643K / M643M / NL643 (SEA WATER PUMP)

$7.77

NL-25-18325
Hassle-Free Return Item

IMPELLER - M673 M673D / M643 (FOR NL-25-18305 RAW WATER PUMP)

$53.39

NL-340460170
Hassle-Free Return Item

RAW WATER PUMP DRIVE GEAR - M673 / M673D

$307.62

888.640.4791 (U.S.)|225.706.4858 (Int.)

Monday-Friday 7am-5pm CST
8784 S. Choctaw Dr. Baton Rouge, LA 70815
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