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REV Group Cummins ISL DEF Head Unit

REV GROUP CUMMINS ISL DEF HEAD UNIT

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$1,295.00

CORE CHARGE:

$250.00
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 NUMBER 719006
PART TYPE DEF Head Unit
BRAND Tamerx Diesel Products
ENGINE MAKE Cummins
ENGINE TYPE ISL
YEAR
PART NUMBER 5410-11-FA01-5
APPLICATION NOTES REV Group
ADDITIONAL NOTES DEF Header, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 5410-11-FA01-5 ( OEM Part Number 719006 ). This part is primarily made for a Cummins ISL, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: DEF Header, 40 MICRON, 11"

OEM NUMBERS

Primary OEM719006
Additional OEM719006

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490541627
WEIGHT8.00 LBS

SHIPPING OPTIONS

Ship Weight : 8.00 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.


Empower your fleet’s emissions performance with the REV Group Cummins ISL DEF Head Unit — engineered for precision, durability, and seamless compatibility. This rugged, OEM-grade unit delivers real-time monitoring of DEF level, temperature, and quality, helping your SCR system stay optimized and prevent costly derates. Built tough for fleet duty and backed by Tamerx’s commitment to quality, it’s the emissions solution that keeps you clean, compliant, and confident on the road.

PEOPLE ALSO ASKS | BLOG(S)

For fleets running REV Group vehicles with Cummins ISL engines, keeping the SCR (Selective Catalytic Reduction) system operating cleanly and reliably is essential. A key part of that control loop is the DEF (Diesel Exhaust Fluid) head unit. The DEF Head Unit designed to OEM 719006 specifications isn’t merely a sensor—it’s the gatekeeper of accurate urea dosing and emissions compliance. If it fails or drifts out of spec, your engine may respond with warning codes, derates, or degraded performance.

  • Measures DEF fluid level, temperature, and urea concentration, supplying real-time data back to the engine’s control module

  • Adjusts dosing of DEF into the exhaust stream precisely to allow the SCR system to reduce NOx effectively

  • Built to OEM 719006 tolerances, enabling plug-and-play compatibility with REV Group Cummins ISL systems

  • Helps prevent fault codes, check engine warnings, and engine derates caused by sensor drift or inaccurate feedback

  • Equipped with internal filtration to help guard against contamination upstream in the system

  • Designed to handle real-world stresses: vibration, temperature swings, and exposure to DEF fluid chemistry

In operations where downtime is costly, overlooking the DEF head unit is a risky gamble. Installing a high-quality, OEM-matched unit restores the integrity of your emissions feedback loop, ensures consistent SCR efficiency, and reduces the chance of surprise system faults. For REV Group ISL applications, this DEF Head Unit isn’t optional—it’s foundational.

The DEF (Diesel Exhaust Fluid) head unit is a crucial part of a diesel engine’s emissions system, monitoring fluid level, quality, and temperature. While it’s designed to be durable, it doesn’t last forever. Knowing how long it usually lasts can help operators plan maintenance and avoid unexpected breakdowns.

Factors That Affect DEF Head Unit Lifespan

  • Average Lifespan
    In most cases, a DEF head unit lasts 5 to 7 years under normal driving and operating conditions.

  • Vehicle Usage
    Heavy-duty trucks or high-mileage vehicles may see shorter lifespans than light-duty or infrequently used equipment.

  • Environmental Conditions
    Exposure to extreme cold, high heat, or outdoor storage can accelerate wear on sensors and electronics.

  • DEF Fluid Quality
    Using only ISO-compliant, uncontaminated DEF protects sensors from damage and helps extend unit life.

  • Maintenance Practices
    Regular inspections, keeping the tank clean, and careful handling during service improve reliability.

  • Signs of Aging
    False quality alerts, inaccurate DEF level readings, or recurring fault codes often suggest the unit is nearing the end of its service life.

While a DEF head unit is built to last several years, its exact lifespan depends on usage, environment, and care. By using clean DEF, protecting the system from extreme conditions, and staying proactive with maintenance, operators can maximize service life and keep their vehicles compliant and dependable.

Yes — excessive vibration or impacts can damage sensors, loosen connectors, or cause leaks.

Use a diagnostic tool to view live level and temperature data and verify that no fault codes are present.

Use high-quality DEF, avoid contamination, clean the strainer regularly, and check sensor/heater performance.

The engine may go into derate mode, display DEF system warnings, or lose emissions compliance until repaired.

Cummins DEF Head Units

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