DEF Cap : OEM ASP-DCL-0301
DEF CAP : OEM ASP-DCL-0301
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a New, DuraWRX DEF Cap, DuraWRX part number ASP-DCL-0301 ( OEM Part Number ASP-DCL-0301 ). This part is primarily made for a , and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
Additional Notes: DEF Cap, Locking, Lanyard w/ Loop
OEM NUMBERS
| Primary OEM | ASP-DCL-0301 |
| Additional OEM | 1112302-004, 1112302-007, 160599000098A, 185151, 500-2691, 620900, 10052052, 82164182, 82266079, 82402503, 90035362, 853031077, 4812011104, 4812011680, 4812014605, 4812274586, ASP-DCL-0301 |
ADDITIONAL DETAILS
| CONDITION | New |
| UPC / Barcode | |
| WEIGHT | 1.00 LBS |
SHIPPING OPTIONS
Ship Weight : 1.00 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.
"This Product Doesn't Have a Core"
Built to maintain a secure seal on the DEF reservoir, the OEM ASP-DCL-0301 DEF Cap helps keep contaminants such as dust, moisture, and debris from entering the system. This cap ensures the DEF supply remains clean and protected, supporting proper operation of downstream dosing and emissions components. Its OEM-grade construction provides accurate fitment, stable closure, and durability during repeated use and exposure to demanding environments. When issues like worn threads, weakened sealing, or residue around the tank opening appear, this cap offers a reliable replacement option. Made with sturdy materials and precise engineering, it helps uphold consistent DEF system integrity across all compatible applications.
PEOPLE ALSO ASKS | BLOG(S)
The DEF Cap (OEM ASP-DCL-0301) is a protective cap designed to seal and safeguard the Diesel Exhaust Fluid tank. Because DEF is extremely sensitive to contamination, this cap is engineered with specific components that ensure a tight seal, maintain fluid quality, and support proper tank function. Each part of the cap plays a role in keeping the DEF system clean and reliable.
Key Components of the DEF Cap
- Outer Cap Housing
- A durable, DEF-resistant plastic shell that provides strength and protects internal components. This is the portion handled during opening and closing.
- Threaded Locking System
- Integrated threads allow the cap to secure tightly onto the tank’s filler neck. The threads prevent loosening from vibration and ensure consistent closure.
- Internal O-Ring or Gasket
- A chemical-resistant sealing ring that forms an airtight barrier. This prevents moisture, dirt, and dust from entering the DEF tank.
- Vent or Pressure Relief Feature (if equipped)
- Some caps include a small venting mechanism to allow pressure equalization inside the tank while still blocking contaminants.
- Grip Tabs or Textured Surface
- Raised edges or textured designs that make the cap easy to twist, even when wearing gloves or working in cold conditions.
- Tether Attachment Point (if included)
- A molded connection point that allows a tether or strap to keep the cap attached to the equipment, preventing loss during refilling.
Together, these parts provide a secure seal that protects DEF purity and helps the SCR system operate correctly. A well-designed cap prevents contamination, reduces crystallization around the filler neck, and ensures consistent DEF flow throughout the emissions system.
A DEF cap may seem like a simple component, but it plays a crucial role in protecting the Diesel Exhaust Fluid system from contamination. When the cap becomes damaged or stops sealing correctly, it can lead to DEF quality issues, system warnings, and potential derate. Diagnosing a faulty cap early helps prevent unnecessary repairs.
The first step is a visual inspection. Because the cap provides a protective seal, any flaw that affects its fit or gasket can introduce moisture, dust, or debris into the DEF tank.
Steps to diagnose a faulty DEF cap include:
- Check for cracks or warping on the cap body
- Inspect the gasket for tears, flat spots, or missing sections
- Look for crystallized buildup around the threads or sealing surface
- Ensure the cap tightens securely without excess play
- Check for DEF residue or moisture near the tank opening
- Watch for repeated DEF quality warnings, which may indicate contamination
If the cap fails to seal properly or shows visible wear, it is likely no longer protecting the system. Replacing it promptly helps maintain DEF purity and reduces the risk of faults triggered by contaminated fluid.
A simple inspection can save you from costly DEF system repairs later.
It securely closes the DEF tank opening to keep the fluid clean and prevent environmental contaminants from entering.
Proper fitment ensures the tank maintains the intended seal and venting characteristics required for accurate DEF system operation.
You may experience DEF crystallization, contamination, or repeated system quality alerts.
It prevents debris and moisture from entering the tank, reducing the risk of clogs or pump damage.
