CUMMINS 3866789 EXPANSION TANK Original OEM part
CUMMINS
- Payment Methods
-
- SKU:
- CUMMINS 3866789
- MPN:
- 3866789
- Condition:
- New
- Shipping:
- $45.00 (Fixed Shipping Cost)

Available Inventory
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Competitive Pricing
Enjoy competitive rates and great deals on every order.
Customer Support
Our team is always ready to answer your questions and provide the best assistance.
Description
- Precision engineered for dependable power management
- Durable construction ensures long-term cooling system stability
- Maintains optimal coolant pressure and prevents overheating
- 100% genuine CUMMINS OEM part guaranteeing flawless fit and performance
CUMMINS 3866789 EXPANSION TANK – Powering Reliability, Crafted for Endurance
The CUMMINS 3866789 Expansion Tank is integral to preserving your engine’s temperature balance, offering unmatched durability and engineered precision that only a true OEM component can provide. Designed for longevity and peace of mind, this tank supports your CUMMINS system’s efficiency and safety under demanding conditions. Upgrade now and ensure your equipment runs flawlessly; safeguard your investment with authenticity.
Essential Feature That Protects Your Engine
- Engineered to stabilize coolant pressure, preventing leaks and overheating
- Timely replacement preserves engine integrity, avoiding costly downtime
- Order your genuine CUMMINS expansion tank today for assured compatibility and peace of mind
Details
Product SKU: CUMMINS 3866789
We are committed to helping you select the right part with expert advice tailored to your needs. Reach out through our help center anytime; we are passionate about supporting your successful repairs and wish you the best experience on your journey to lasting engine performance.
Returns Information
You may return new, non-used, and unopened items within 30 days of delivery date under a 20% re-stocking fee in case you do not need it anymore or you have ordered a wrong item.
We cannot accept any returns on "Pumps, Motors, Electrical Items & Transmissions" whether the product is used or new, however in rare cases we may allow an exception under a 40% re-stocking fee.
If you need to return an item, please go to our chat located in the lower right corner, select the option “Returns” and follow the steps to submit your request. Please have on your hands pictures of the item, they will be requested. You will shortly receive an answer from our Customer Service Team providing authorization and return instructions. Likewise, if an exception cannot be authorized, you will receive an answer from us. No returns will be accepted in our warehouse without an RMA number (Return Merchandise Authorization).
All return shipping costs are on customer's responsibility and will not be refundable.
Returns are inspected once they arrive. If the inspection determines that the items are used, non-resellable condition, or damaged, the return will be denied and the customer will be contacted to ship the parts back at the customers' request and cost.
Cancellations
You may cancel your order, in whole or in part, only if the part is backordered and it isn't ready to ship. Once an order has been shipped, sent from the supplier to our warehouse, or in the dispatch line, we cannot cancel it. If your order is shipped, you will need to follow our return policy to return the items you no longer want.
If you need to cancel an order or item for any reason, you may submit a cancellation request directly through your account to the "more options" section or contact us by live chat. All the cancellation requests are evaluated before its approval. If you submit a cancellation request out of business hours, on a weekend or holiday, it will be processed on the next available business day.
Please allow for the cancellation to be confirmed, and check your account for updates on the status. The cancellation process usually takes 24-48 hours to be confirmed by email. We will process your cancellation request and issue a refund to your original payment method.
In the event that an item becomes no longer available (NLA), we will cancel it from your order and ship the remaining items to you. We will send you an email notification if we cancel any part of your order.
Some products may contain chemicals known to the State of California to cause cancer or reproductive harm. ⚠️ WARNING: www.P65Warnings.ca.gov