591-3427 | Genuine CAT® Diesel Exhaust Fluid (DEF) Header 11"

SKU: 591-3427 MPN: 591-3427

DEF delivery stays dependable with a Genuine CAT Diesel Exhaust Fluid Header built for accurate fluid supply. Part number: 591-3427. Condition: new. Supporting proper DEF flow and reliable emissions system operation.

$1,179.00
No Core Charge
8 in stock, ready to ship

Pickup available at Warehouse - Howard st 7092 ste F

Usually ready in 24 hours

Need it fast? We offer overnight shipping

Contact us to check if overnight next-day delivery is available for your order - PN: 591-3427

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    Orders before 7 PM EST ship same business day
  • Location icon, warehouse pickup point.
    Pickup available. Usually ready in 24 hours

Product Description

Product Name Diesel Exhaust Fluid (DEF) Header Product Name Diesel Exhaust Fluid (DEF) Header
Brand Caterpillar® Brand Caterpillar®
Condition New Condition New
Part Number 591-3427 Part Number 591-3427
Cross Reference 5913427 Cross Reference 5913427
Specifications
DEF Header Height (IN) 11 DEF Header Height (IN) 11
DEF Return Fitting Dia. (IN) 5/16 SAE J2044 DEF Return Fitting Dia. (IN) 5/16 SAE J2044
Coolant Outlet Fitting Dia. (IN) 5/8 Hose Bead Coolant Outlet Fitting Dia. (IN) 5/8 Hose Bead
Tank Interface 4.05 Dia. Bore Seal Tank Interface 4.05 Dia. Bore Seal
Electrical Connector Deutsch DT4 (STD) Electrical Connector Deutsch DT4 (STD)
Sensor Type Digital (canbus) Sensor Type Digital (canbus)
DEF Suction Fitting Dia. (IN) 3/8 SAE J2044 DEF Suction Fitting Dia. (IN) 3/8 SAE J2044
Coolant Inlet Fitting Dia. (IN) 5/8 Hose Bead Coolant Inlet Fitting Dia. (IN) 5/8 Hose Bead
In-Tank Filter 40µ In-Tank Filter 40µ

Useful Information

Description and Purpose:

Part number 591-3427 designates this Genuine New CAT Diesel Exhaust Fluid (DEF) Header, an 11-inch digital assembly built to manage your emissions fluid. It features a CANbus sensor for precise level monitoring and coolant lines to thaw frozen DEF. Additionally, the unit includes a 40-micron filter to ensure only clean fluid reaches the dosing system. Сross reference: 5913427

Why Replacement is Important:

A bad header often leads to "derate" codes or frozen tanks in winter. Replacement is the immediate fix for digital communication errors or clogged suction lines that starve the pump.

Impact on Vehicle Performance:

Installing this unit guarantees accurate data flow to the ECM. It prevents sudden power loss events and ensures the aftertreatment system functions correctly without triggering dashboard warnings.

Manufacturer Information:

Caterpillar® applies rigorous engineering and quality standards to deliver parts that ensure reliable performance, precise integration, and long-term durability.

Tags & Category: Diesel Exhaust Fluid Header, DEF Header Assembly, DEF Tank Header, DEF Supply Module, DEF Pump Header, SCR DEF System Component, Aftertreatment DEF Module, Caterpillar DEF Header, Diesel Emissions System, DEF Tank Interface, (DEF) SCR System

Warranty:

Parts Finder Q offers a 365-days warranty for all types of parts in any condition. The warranty applies exclusively to purchases made directly through our website (partsfinderq.com). Please note that purchases made through third-party platforms like eBay or Amazon are not covered by this warranty.

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  • Icon Truck, Fast Delivery
    Free shipping over $199 Place an order today and receive it on Mar 6
  • Clock Icon
    Orders placed before 7-PM EST will ship same business day
  • Location icon, warehouse pickup point.
    Pickup available usually ready in 24 hours
  • Need it fast? We offer overnight shipping

    Contact us to check if overnight next-day delivery is available for your order - PN: 591-3427