Product Description
The CUMMINS 3943300 OEM VERTICAL WATER NECK (WATER OUTLET CONNECTION) is designed for 2003–2009 5.9L and 6.7L Cummins diesel engines. This genuine Cummins cooling system component connects the engine cooling passages to the upper radiator hose and helps direct coolant flow from the engine to the radiator.
Use this part when replacing a damaged, corroded, leaking, or worn water outlet connection. Maintaining proper coolant flow is critical for engine temperature control and cooling system reliability. Always verify fitment by engine serial number before ordering.
FEATURES
- Genuine Cummins OEM water outlet connection
- Direct-fit replacement vertical water neck
- Designed for 5.9L and 6.7L Cummins diesel engines
- Helps maintain proper coolant flow and cooling system operation
- Durable OEM construction for long service life
- Ideal for cooling system repairs and maintenance
FITMENT
- 2003–2007 Dodge Ram 2500/3500 5.9L Cummins
- 2007.5–2009 Dodge Ram 2500/3500 6.7L Cummins
- Select Cummins industrial and commercial applications using Cummins 3943300
WHAT'S INCLUDED
- 1 Cummins 3943300 OEM Vertical Water Neck
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3943300
- Cummins Thermostat Components
- Cummins Water Pump Assemblies
- Cummins Cooling System Gaskets and Seals
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3943300
- Part Type: Vertical Water Neck / Water Outlet Connection
- Engine Compatibility: 5.9L Cummins, 6.7L Cummins
- Fitment Years: 2003–2009
- Vehicle Application: Dodge Ram 2500 and 3500
- Condition: New OEM Cummins
- Cooling System Component: Yes
- Installation Type: Direct Replacement
FAQ
Will this water neck fit my truck?
This part fits many 2003–2009 5.9L and 6.7L Cummins applications. Always verify your engine serial number before ordering.
What does the water neck do?
The water neck serves as the coolant outlet connection between the engine and upper radiator hose, helping direct coolant flow to the radiator.
Is this a genuine Cummins part?
Yes. Cummins 3943300 is a genuine OEM Cummins cooling system component built to factory specifications.
What are signs of a failing water neck?
Common signs include coolant leaks, corrosion, damaged hose connections, cracked housings, or evidence of coolant seepage around the outlet connection.
What is included?
This listing includes one Cummins 3943300 OEM vertical water neck.
Do I need any related parts?
Inspect related gaskets, thermostats, radiator hoses, hose clamps, and cooling system components during installation and replace worn parts as necessary.
