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Global Environmental Products Cummins ISL DEF Head Unit

GLOBAL ENVIRONMENTAL PRODUCTS CUMMINS ISL DEF HEAD UNIT

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$895.00

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 NUMBERGS335620
PART TYPEDEF Head Unit
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISL
YEAR
PART NUMBER4310-11-7
APPLICATION NOTESGlobal Environmental Products
ADDITIONAL NOTESDEF Header, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-11-7 ( OEM Part Number GS335620 ). 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 OEMGS335620
Additional OEMGS335620

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490539952
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.


Boost your emissions game with the Global Environmental Products Cummins ISL DEF Head Unit — precision engineered for seamless compatibility and built to last. This rugged unit delivers real-time tracking of DEF level, temperature, and quality so your SCR system stays optimized and derates stay away. With easy integration and dependable performance, it’s the emissions upgrade your setup deserves.

PEOPLE ALSO ASKS | BLOG(S)

For fleet operators using Global Environmental Products systems on Cummins ISL engines, the DEF (Diesel Exhaust Fluid) head unit is a silent but essential part of the emissions chain. The Global Environmental Products Cummins ISL DEF Head Unit (OEM GS335620, Tamerx part 4310-11-7) delivers the monitoring and control your SCR (Selective Catalytic Reduction) system depends on. A failure or drift here can lead to error codes, derates, or emissions noncompliance—none of which you want to face in the field.

  • Monitors DEF fluid level, temperature, and urea concentration, sending accurate signals to the ECU

  • Regulates precise dosing of DEF into the exhaust stream so NOx reductions stay efficient

  • Built to meet OEM GS335620 tolerances for plug-and-play compatibility with Global Environmental Products / Cummins ISL systems

  • Helps prevent warning codes, fault codes, and engine derates triggered by sensor drift or inaccurate feedback

  • Designed to survive vibration, thermal cycling, and corrosion from DEF fluid

  • Includes a 40-micron filter to help guard downstream injectors from contamination

Don’t let a degraded DEF head be the weak link in your emissions infrastructure. Installing the correct OEM GS335620 / 4310-11-7 DEF Head Unit restores your system’s accuracy, stabilizes SCR performance, and protects your vehicle from surprise faults or compliance issues. In modern diesel systems, precise feedback is everything—and this module is one you can’t afford to get wrong.

The DEF (Diesel Exhaust Fluid) head unit relies on accurate monitoring of fluid level, temperature, and quality to keep emissions systems compliant. Because it is directly exposed to the DEF tank environment, temperature changes—whether freezing cold or extreme heat—can significantly impact its performance and reliability.

Effects of Temperature on DEF Head Unit Performance

  • Freezing Temperatures
    DEF begins to freeze at about 12°F (-11°C). Frozen fluid can delay accurate readings until thawed, sometimes triggering temporary warnings.

  • High Heat Conditions
    Prolonged exposure to excessive heat can cause DEF to degrade, stressing sensors and potentially leading to false fault codes.

  • Rapid Temperature Swings
    Sudden shifts from hot to cold can strain the sensors and electronics, leading to inconsistent or erratic readings.

  • Crystallization Risks
    Freeze-thaw cycles encourage DEF crystallization, which can build up around the sensors and interfere with proper function.

  • Electronics Durability
    Extreme weather conditions can shorten the overall lifespan of the DEF head unit’s internal components.

Temperature plays a major role in how well the DEF head unit performs. Freezing, overheating, and rapid climate changes all put stress on the system and may cause inaccurate readings or premature failure. Protecting vehicles from extreme conditions and using clean, high-quality DEF helps ensure reliable operation year-round.

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

Possible faults include “level sensor out of range,” “temperature sensor failure,” or “filter clogged."

Use a diagnostic scanner to view live level and temperature readings and confirm no DEF-related error codes.

Use high-quality, ISO-compliant DEF, avoid contamination, clean or replace filter periodically, and check sensor/heater health.

 

Cummins DEF Head Units

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