ONAN 503-1861 RADIATOR UPPER HOSE - ONAN Genuine OEM Part
ONAN
- Payment methods
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- SKU:
- ONAN 503-1861
- MPN:
- 503-1861
- Condition:
- New
- Availability:
- Ships (leaves our warehouse) within next business day if in stock


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
- Certified Genuine ONAN OEM replacement part for assured compatibility and durability
- Ensures efficient coolant flow, maintaining optimal engine operating temperature
- Resistant to heat and pressure to prevent leaks and premature failures
- Engineered to uphold Cummins/Onan’s legacy of precision and long-term reliability
ONAN 503-1861 RADIATOR UPPER HOSE - Power your system with supreme OEM quality and unwavering endurance
The ONAN 503-1861 radiator upper hose plays a critical role in your generator’s cooling system by facilitating steady coolant circulation to prevent engine overheating. Crafted to exact Cummins/Onan specifications, it guarantees a seamless fit and lasting reliability under rigorous conditions. Secure this vital component to protect your power system and maintain peak performance—add the ONAN 503-1861 to your cart and invest in dependable operation.
A heartfelt commitment to genuine performance and peace of mind
- Original equipment manufacturer authenticity ensures flawless integration with your generator
- Durable construction withstands thermal and mechanical stress for extended service life
- Preserves engine health by maintaining consistent cooling efficiency
- Supports emissions compliance through reliable temperature management
- Contributes to quieter, smoother system operation by preventing coolant leaks
Details
Category: Radiator Hoses
Product SKU: ONAN 503-1861
Our knowledgeable support team is always ready to assist you in selecting the right parts to maintain your Cummins/Onan generator at peak condition. Feel free to reach out via our help center for expert guidance. We are passionate about helping you achieve the best repair outcome and ensuring your investment in quality parts delivers lasting value.
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