DEF Injector / DEF Valve | Volvo / Cummins / Mack | Volvo 22391563 ~ Cummins 2888173 ~ Mack 22391565 | FleetRun FR-AFTR263


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6 Month / 50,000 Mile Warranty

 Part Number

  • FleetRun: FR-AFTR263

Cross Reference Part Number

  • Volvo:  22391563 / 21575532 / 21332704 / 21243945
  • Mack: 22391565 / 21332711 / 21577030 / 
  • Cummins: 2888173 / 2888173NX / 2888173RX
  • Bosch: 444043051 / 444043053 / 444043088 / 444043033
  • Misc. Industry Part Number: VTC-42632 / DV1001 / 21332711P02


  • 2 Pin Electrical Connector
  • 3 Mounting Bolt Holes

Please note: this is an aftermarket part, the use of other manufacturer's names, part numbers or trademarks is for informational purposes only.

Please verify OEM part numbers before purchasing, FleetRun assumes no liability related to product use and fitment.

  • 1 ~ Sealing Plate ~ DEF Injector / DEF Valve | Volvo / Cummins / Mack | Volvo 21376801 
  • 2 ~ Coolant Supply / Drain Fitting ~ DEF Injector / DEF Valve | Volvo / Cummins / Mack | Volvo 21376813
  • 1 ~ DEF Supply Fitting ~ DEF Injector / DEF Valve | Volvo / Cummins / Mack | Volvo 21377177

Introducing the FleetRun FR-AFTR263 Diesel Exhaust Fluid Injector for Volvo, Mack, and Cummins engines. If you're looking for a high-quality DEF injector that meets or exceeds OEM standards, look no further. This DEF dosage valve is engineered with quality in mind, ensuring that your engine's Selective Catalytic Reduction (SCR) system is running at optimal efficiency.

With a 2-pin electrical connector and 3 mounting bolt holes, installation is a breeze. The kit includes a sealing plate, DEF supply fitting, and coolant supply/drain fittings. All of the necessary parts are included to make sure that your installation is a success.

This Diesel Exhaust Fluid dosage valve is compatible with a wide range of engines and vehicles, including Cummins ISX, Cummins X15, Volvo D13, Volvo D11, Mack MP7, and Mack MP8. It is also compatible with a variety of popular truck models.

Not only is this DEF injector an exact fit for your engine, it also comes with a 6 month or 50,000 mile warranty (whichever comes first). This gives you peace of mind knowing that your investment is protected.

If you're looking for other aftertreatment and emissions parts, be sure to check out our related products, such as the FleetRun FR-AFTR876 Diesel Exhaust Fluid (DEF) Filter Kit.

At FleetRun, we're committed to providing our customers with the highest quality DEF injectors and other truck parts. If you have any questions or concerns, please don't hesitate to reach out to our knowledgeable team. And don't forget to visit our Shop Talk page for helpful tips and tricks from our experienced technicians and industry professionals.

Choose the FleetRun FR-AFTR263 DEF Injector for reliable and efficient SCR system performance.


  • Cummins ISX
  • Cummins X15
  • Volvo D13
  • Volvo D11
  • Mack MP7
  • Mack MP8


  • 2010-2023+ Volvo VNL, VNM, VN Series
  • 2010 Freightliner Century
  • 2010-2018 Freightliner Cascadia
  • 2018-2023+ Kenworth W990
  • 2010-2023+ Kenworth W900
  • 2014-2023+ Kenworth T880
  • 2010-2023+ Kenworth T800
  • 2013-2023+ Kenworth T680
  • 2010-2023+ Peterbilt 389
  • 2012-2023+ Peterbilt 579
  • 2010-2015 Peterbilt 386
  • 2010-2016 Peterbilt 587
  • Western Star 4800
  • Western Star 4900
  • 2020-2023+ Western Star 49X
  • 2015-2023+ Western Star 5700XE
  • 2010-2023+ International LoneStar
  • International PayStar
  • 2010-2016 International ProStar
  • 6 month or 50,000 Miles From Purchase (whichever comes first)

What are the symptoms of bad DEF injector?

  • A bad DEF injector can cause a number of symptoms that can negatively impact your vehicle's performance. One of the most common signs of a bad DEF injector is DEF crystallization in the lower DPF assembly, which can lead to other symptoms include check engine fault codes and engine derate. Other symptoms include: increased or decreased DEF consumption, and a weak mist or incorrect amount of DEF being sprayed when tested with a diagnostic computer. It's important to address these symptoms right away to prevent further damage and ensure your vehicle is operating at its best. If you suspect a problem with your DEF injector, it's always best to consult with a professional mechanic or technician for proper diagnosis and repair.

Can you clean a DEF injector?

  • It is possible to clean a DEF injector if you are very careful and have the appropriate knowledge and tools. Cleaning the DEF injector can sometimes help with DEF related codes, especially if the codes are caused by crystallization on the injector nozzle. However, it is important to keep in mind that cleaning a DEF injector is not always a guaranteed fix and the injector may still need to be replaced if it is not functioning properly. If you do attempt to clean a DEF injector, it is crucial to replace the gasket once the injector is reassembled to ensure a proper seal and prevent any leaks.