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Cummins QSB 6.7L Decomposition Reactor Tube 2014-2022: OEM 4394302

CUMMINS QSB 6.7L DECOMPOSITION REACTOR TUBE 2014-2022: OEM 4394302

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$1,595.00

CORE CHARGE:

$500.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER4394302
PART TYPEDecomposition Reactor Tube
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEQSB 6.7L
YEAR2014-2022
PART NUMBER4394302RM-DECOMP
APPLICATION NOTESTier 4 Off Highway

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx Decomposition Reactor Tube, Tamerx part number 4394302RM-DECOMP ( OEM Part Number 4394302 ). 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 QSB 6.7L, production years 2014-2022, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM4394302
Additional OEM4394302, A052J812

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490555907
WEIGHT20.00 LBS

SHIPPING OPTIONS

Ship Weight : 20.00 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.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


Maintain efficient DEF dosing with the **Cummins QSB 6.7L Decomposition Reactor Tube 2014–2022 (OEM 4394302)**. Designed for Cummins QSB 6.7L engines, this decomposition reactor tube directs and mixes diesel exhaust fluid within the aftertreatment system to support effective emissions reduction. Manufactured to OEM specifications, it provides precise fitment and dependable compatibility for the listed model years. Replacing a damaged or restricted reactor tube helps promote proper exhaust treatment, reliable system operation, and long-lasting emissions performance.

FITMENT CHART

YEARMAKEENGINE(S)
2014Cummins QSB 6.7L
2015Cummins QSB 6.7L
2016Cummins QSB 6.7L
2017Cummins QSB 6.7L
2018Cummins QSB 6.7L
2019Cummins QSB 6.7L
2020Cummins QSB 6.7L
2021Cummins QSB 6.7L
2022Cummins QSB 6.7L

PEOPLE ALSO ASKS | BLOG(S)

The Cummins QSB 6.7L Decomposition Reactor Tube 2014-2022 OEM 4394302 is an essential part of the diesel aftertreatment system, helping prepare Diesel Exhaust Fluid (DEF) before it reaches the SCR catalyst. One of the most searched topics related to decomposition reactor tubes is their role in DEF conversion and emissions system operation. Using the correct OEM replacement helps maintain proper exhaust flow and reliable aftertreatment performance.

  • OEM 4394302 is designed for 2014-2022 Cummins QSB 6.7L engine applications, providing dependable OEM-style compatibility.
  • Helps convert injected DEF into the proper gaseous form before it enters the SCR catalyst for emissions treatment.
  • Supports efficient DEF distribution, promoting consistent operation throughout the aftertreatment system.
  • Constructed from heat-resistant materials to withstand the high temperatures generated within the exhaust system.
  • Engineered for precise fitment, allowing seamless integration with the factory exhaust and emissions components.
  • Maintains proper exhaust gas routing, helping the SCR system function as designed during normal operation.
  • Designed for durability and long service life, making it a dependable replacement for worn or damaged reactor tubes.

The Cummins QSB 6.7L Decomposition Reactor Tube 2014-2022 OEM 4394302 is a reliable solution for maintaining proper DEF preparation within your vehicle's emissions system. With its OEM-quality construction, direct-fit design, and dependable exhaust flow management, it helps support efficient SCR operation and long-lasting aftertreatment system reliability.

High temperatures, contamination, and normal wear can all contribute to the failure of a decomposition reactor tube over time. As an important part of the Selective Catalytic Reduction (SCR) system, the tube helps convert Diesel Exhaust Fluid (DEF) into ammonia before it reaches the catalyst. When it becomes damaged or restricted, the efficiency of the entire aftertreatment system can be affected.

  • DEF deposits and crystallization can accumulate inside the tube, restricting proper flow and reducing system efficiency.
  • Repeated exposure to extreme exhaust temperatures may cause the tube to crack, warp, or deteriorate over time.
  • Contaminated or poor-quality DEF can leave residue that interferes with proper DEF decomposition.
  • Faulty DEF injectors can spray an incorrect amount of fluid, leading to excessive buildup inside the reactor tube.
  • Exhaust leaks or damaged mounting hardware may expose the tube to abnormal heat and vibration, increasing the risk of failure.
  • Lack of routine maintenance can allow deposits and minor issues to worsen until the tube becomes restricted or damaged.
  • Problems with related aftertreatment components, such as sensors or the SCR system, can contribute to operating conditions that shorten the tube's service life.

Understanding what causes a decomposition reactor tube to fail can help prevent unexpected emissions system problems. Regular inspections, quality DEF, and prompt repairs of related aftertreatment components help keep the reactor tube functioning properly and support reliable SCR system performance.

Yes, continuous vibration can loosen mounting hardware or cause cracks in the reactor tube over time. Regular inspections help identify these issues before they worsen.

Using clean DEF, maintaining the DEF dosing system, and repairing exhaust leaks promptly help protect the reactor tube. Routine emissions system inspections are also recommended.

Yes, restrictions inside the reactor tube can interfere with DEF decomposition and reduce SCR efficiency. This may result in increased NOx emissions and diagnostic fault codes.

Worn clamps or leaking seals can allow exhaust gases to escape before reaching the aftertreatment components. Proper sealing helps maintain correct exhaust flow and system performance.

Cummins Decomposition Reactor Tubes