4388378 | Genuine OEM Cummins DEF Filter Kit for ISB/QSB

4388378 Genuine OEM Cummins DEF Filter Kit for ISB/QSB is a replacement component designed for use in the Diesel Exhaust Fluid (DEF) system of compatible Cummins engines. This filter kit helps maintain proper DEF filtration and supports the intended operation of the engine aftertreatment system.

PRODUCT INFORMATION

Part Number: 4388378
Brand: Cummins
Condition: Genuine OEM
Component: DEF Filter Kit
Fuel Type: Diesel
Engine Applications: Cummins ISB/QSB (compatibility to be verified)
Other important specifications: Diesel Exhaust Fluid filtration system component

APPLICATIONS

The 4388378 DEF Filter Kit is intended for applicable Cummins ISB and QSB engine configurations equipped with compatible DEF and exhaust aftertreatment systems. Exact fitment should be confirmed using the original part number, engine serial number, and vehicle or equipment information.

FUNCTION

The 4388378 DEF Filter Kit is designed to help filter Diesel Exhaust Fluid before it reaches the relevant components of the exhaust aftertreatment system. Proper filtration helps support reliable DEF system operation and the intended function of the Selective Catalytic Reduction (SCR) emissions control system.

A worn, clogged, damaged, or failing DEF Filter Kit may cause symptoms such as:
• DEF system warning messages
• SCR or aftertreatment system fault codes
• Restricted DEF flow
• DEF dosing or emissions control performance issues
• Reduced aftertreatment system efficiency
• Engine derating or reduced power associated with emissions system faults

WHY REPLACE A DEF FILTER KIT?

A clogged or damaged DEF filter can interfere with proper fluid filtration and affect the operation of the aftertreatment system. Replacing it with the correct Genuine OEM Cummins component can help maintain proper DEF filtration, support reliable emissions control operation, and reduce the risk of contamination-related issues.

FITMENT INFORMATION

Before purchasing, verify the Part Number, VIN, engine serial number, vehicle or equipment model, engine, and configuration to confirm the correct application. Do not assume compatibility based only on the ISB/QSB engine family or the appearance of the part.

If you are unsure whether this part is correct for your vehicle, please contact us with your VIN and original part number. We are happy to help verify compatibility before purchase.

GENUINE CUMMINS PART

Part Number: 4388378