Loading...

Cummins ISB 6.7L Decomposition Reactor Tube 2018-2022: OEM 5418126

CUMMINS ISB 6.7L DECOMPOSITION REACTOR TUBE 2018-2022: OEM 5418126

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$1,895.00

AVAILABILITY IN STOCK
OEM NUMBER5418126
PART TYPEDecomposition Reactor Tube
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISB 6.7L
YEAR2018-2022
PART NUMBER5418126-OE
ADDITIONAL NOTESDecompositio Reactor

PRODUCT DESCRIPTION

This is a New Tamerx Decomposition Reactor Tube, Tamerx part number 5418126-OE ( OEM Part Number 5418126 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a Cummins ISB 6.7L, production years 2018-2022, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: Decompositio Reactor

OEM NUMBERS

Primary OEM5418126
Additional OEM5418126

ADDITIONAL DETAILS

CONDITIONNew
UPC / Barcode00840490554023
WEIGHT35.00 LBS

SHIPPING OPTIONS

Ship Weight : 35.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

"This Product Doesn't Have a Core"


Built for efficient exhaust flow within the aftertreatment system, the Cummins ISB 6.7L Decomposition Reactor Tube 2018–2022 (OEM 5418126) plays a key role in the SCR process. Designed for Cummins ISB 6.7L engines, this component helps guide and prepare exhaust gases before further treatment. Manufactured to OEM specifications, it offers proper fitment and dependable compatibility for the listed model years. Using the correct reactor tube helps support smooth emissions system operation and consistent performance.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins ISB 6.7L
2019Cummins ISB 6.7L
2020Cummins ISB 6.7L
2021Cummins ISB 6.7L
2022Cummins ISB 6.7L

PEOPLE ALSO ASKS | BLOG(S)

The decomposition reactor tube is a key section of the diesel aftertreatment system, positioned between the particulate filter and the SCR catalyst. Its primary function is to prepare Diesel Exhaust Fluid (DEF) for the chemical reactions that reduce emissions. In Cummins ISB 6.7L engines, this component helps ensure proper mixing and conversion of DEF before it reaches the SCR stage, supporting efficient exhaust treatment.

  • Facilitates DEF Conversion into Ammonia
    Inside the decomposition reactor, DEF is heated and broken down into ammonia, which is required for the SCR system to neutralize nitrogen oxide (NOx) emissions.
  • Ensures Proper Mixing of DEF and Exhaust Gases
    The internal design creates a swirl or mixing effect, allowing DEF to evenly combine with exhaust gases for consistent chemical reactions in the SCR catalyst.
  • Positioned Between DPF and SCR Components
    The reactor tube connects major aftertreatment components, acting as a transition point where DEF is introduced and prepared before entering the SCR system.
  • Supports Overall Emissions System Efficiency
    By improving DEF distribution and conversion, the reactor tube helps the SCR system operate more effectively, contributing to reduced NOx output and proper emissions control.
  • Designed for Cummins ISB 6.7L Applications (2018–2022)
    Built to OEM 5418126 specifications, this decomposition reactor tube is intended to integrate with the factory aftertreatment setup used in these engine models.

The decomposition reactor tube plays a crucial role in preparing exhaust gases for final treatment. In Cummins ISB 6.7L engines, a properly functioning unit helps ensure effective DEF conversion, supports SCR operation, and maintains balanced emissions control across daily driving conditions.

The decomposition reactor tube is a key component in the SCR system, responsible for breaking down Diesel Exhaust Fluid (DEF) into ammonia before it reaches the catalyst. This process is essential for reducing nitrogen oxide (NOx) emissions. When the reactor tube becomes clogged or fails, it can disrupt DEF conversion and lead to reduced SCR efficiency. Several factors can contribute to this type of failure.

  • DEF crystallization is one of the most common causes. When DEF does not fully vaporize, it can leave behind solid deposits that build up inside the tube.
  • Poor-quality or contaminated DEF can introduce impurities that accelerate buildup and restrict flow.
  • Improper DEF dosing, such as over-injection or uneven spray patterns, can lead to excess fluid accumulation and deposits.
  • Low exhaust temperatures, often caused by short trips or excessive idling, may prevent proper DEF decomposition.
  • Engine issues such as faulty injectors or incomplete combustion can affect exhaust conditions and contribute to clogging.
  • Oil or coolant contamination in the exhaust stream can leave residue inside the reactor tube, reducing its effectiveness.
  • Prolonged neglect of warning lights or fault codes can allow minor buildup to worsen over time.

A clogged or failing decomposition reactor tube can lead to reduced emissions efficiency, warning lights, and possible engine derate. Maintaining proper DEF quality, ensuring correct dosing, and addressing engine or exhaust issues early can help prevent buildup and support reliable SCR system operation.

 

Yes, it is an important part of the emissions system.

The emissions system may not reduce harmful gases properly.

Yes, buildup from DEF or residue can cause blockages.

Yes, it plays a direct role in reducing emissions.

Cummins Decomposition Reactor Tubes

PRODUCT VIDEOS