
Cummins X12, X15 Decomposition Reactor Tube 2018-2024: OEM 5509281
CUMMINS X12, X15 DECOMPOSITION REACTOR TUBE 2018-2024: OEM 5509281

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured Tamerx Decomposition Reactor Tube, Tamerx part number 5509281RM-DECOMP ( OEM Part Number 5509281 ). 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 X12, X15, production years 2018-2024, and comes with a One Million Miles or One Year Warranty.
OEM NUMBERS
| Primary OEM | 5509281 |
| Additional OEM | 5509281 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490558304 |
| WEIGHT | 35.00 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 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, 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 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.
Facilitate proper exhaust treatment with this Cummins X12, X15 Decomposition Reactor Tube for 2018–2024 applications. OEM 5509281 helps mix and decompose DEF within the exhaust stream for effective SCR system operation. A reliable replacement for clogged, damaged, or failing reactor tubes in compatible Cummins X12 and X15 engines.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2018 | Cummins | X12 | X15 | |||
| 2019 | Cummins | X12 | X15 | |||
| 2020 | Cummins | X12 | X15 | |||
| 2021 | Cummins | X12 | X15 | |||
| 2022 | Cummins | X12 | X15 | |||
| 2023 | Cummins | X12 | X15 | |||
| 2024 | Cummins | X12 | X15 | |||
PEOPLE ALSO ASKS | BLOG(S)
Proper diesel exhaust fluid (DEF) conversion is essential for the selective catalytic reduction (SCR) process. The Cummins X12, X15 Decomposition Reactor Tube 2018-2024: OEM 5509281 provides a dedicated exhaust passage where injected DEF can mix with hot exhaust gases and begin converting into ammonia before reaching the SCR catalyst.
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OEM 5509281 is intended for compatible 2018-2024 Cummins X12 and X15 diesel applications.
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DEF decomposition function provides the heated environment needed for injected diesel exhaust fluid to begin breaking down into ammonia.
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Exhaust and DEF mixing helps distribute the injected fluid within the exhaust stream before it reaches the SCR catalyst.
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Controlled exhaust passage guides the DEF and exhaust mixture through the decomposition section of the aftertreatment system.
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Supports SCR chemical reactions by helping prepare the ammonia required for nitrogen oxide (NOx) reduction.
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High-temperature construction withstands continuous exposure to heated diesel exhaust gases.
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Durable metal housing provides structural strength against vibration and repeated heating and cooling cycles.
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Application-specific dimensions and connections help maintain proper alignment with compatible Cummins X12 and X15 aftertreatment components.
The Cummins X12, X15 Decomposition Reactor Tube OEM 5509281 plays an important role in preparing DEF for effective SCR exhaust treatment. Customers searching for a Cummins X12 decomposition reactor tube, Cummins X15 DEF decomposition tube, diesel SCR reactor tube, DEF mixing tube, or OEM 5509281 replacement can find this application-specific component at TamerX Diesel Parts for compatible 2018-2024 applications.
Internal restrictions in a Decomposition Reactor Tube can interfere with proper exhaust flow and the breakdown of Diesel Exhaust Fluid (DEF) within the SCR aftertreatment system. DEF crystallization, soot deposits, contamination, and physical damage can gradually reduce the available passage and affect emissions performance.
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Check diagnostic trouble codes: Use a compatible scan tool to identify SCR efficiency, DEF dosing, exhaust restriction, or other aftertreatment-related faults.
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Inspect for DEF crystallization: Look for hardened white deposits inside the Decomposition Reactor Tube that may indicate excessive DEF accumulation.
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Examine internal surfaces: Use an appropriate inspection camera or visual inspection method to identify soot buildup, debris, or other obstructions.
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Check exhaust backpressure: Compare pressure readings with manufacturer specifications to determine whether an exhaust restriction may be present.
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Inspect the DEF injector: A leaking, clogged, or malfunctioning DEF injector can cause improper dosing and contribute to deposits inside the tube.
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Look for physical damage: Examine the tube for dents, collapsed sections, internal deformation, or heat-related damage that could restrict exhaust flow.
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Inspect connected components: Check nearby exhaust piping, clamps, sensors, and SCR components for restrictions or problems that may produce similar symptoms.
A Decomposition Reactor Tube should be inspected only after the exhaust system has cooled and according to manufacturer service procedures. Identifying internal deposits, damaged sections, and DEF dosing problems can help determine whether cleaning or replacement is necessary and prevent recurring SCR system faults.
The reactor tube provides space for DEF droplets to evaporate and decompose before reaching the SCR catalyst. Proper mixing helps distribute the resulting ammonia throughout the exhaust stream.
Uneven DEF spray distribution can cause liquid droplets to contact internal surfaces instead of mixing effectively with exhaust gases. This may contribute to deposits and reduced SCR conversion efficiency.
White deposits may develop when DEF does not fully evaporate or decompose. Low exhaust temperatures, improper DEF dosing, or poor spray distribution can contribute to deposit formation.
A damaged mixer may disrupt the distribution of DEF and exhaust gases. This can create uneven ammonia distribution and affect the efficiency of the downstream SCR catalyst.
















