Cummins Seal O-ring C Series 3943857, Qty 6.

Super Sessions 4989614,3943857,4076420

Packaging has some slight wear.



If offered Free shipping is for the lower 48 states only.



Any questions? Please send us a message we will gladly assist you in any way we can.


See photo and read description for details. If you have any questions about an item, please don't hesitate to ask!


You'll receive an exact item that is listed. Some items are Sold As Is. Please read all of the description & policy prior to purchase.

All damages are marked on photos and/or mentioned in Description



Please make sure this is the exact part you need Before your purchase.


Fireside Diesel Parts & Performance LLC. Is not responsible for incorrect purchases, please be sure this is the correct part for your application by sending us a message or doing the correct research for your application.



*Items may be repackaged for shipping.


**Free shipping is only for 48 lower states Only.


Freight Free Shipping is to Commercial Business or Terminal.

Any lift gates, residential, etc will have additional shipping fees.

HI, AK and any other US Territories will have shipping costs.


We can quote out shipping prior to order by zip code.


Any listing that accepts returns must be returned in original packaging, Part &/or packaging cannot have ANY damage or return will be rejected.


If an item shows wear from attempts to install or the item shows any signs of damage, return will be rejected. NO refund on return if any of the above apply.


All International shipments: Buyer is responsible for any Shipping, Taxes and Duties.


By chance you are looking for something we may not have listed, send a message through Ebay and we will list it if available.


Privacy Policy We respect your privacy. Any and all information collected will be kept strictly confidential and will not Disclosed to third parties or reused without your permission. Any information you give to us will be held with care & will not be used in ways that you have not consented to.



Return Policy: If you are not satisfied with your purchase, please message us through Ebay. Products that have been abused may not be returned under any circumstances.  All Performance Parts & Accessories are Sold as is and are for OFF ROAD USE ONLY. All opened Engine Kits and gasket kits are non ? returnable. All Industrial and stock parts can be returned under authorization and must have a RGA for return. All returns are subjected to a 20% restocking fee unless authorized differently. Any shipments charges for return, buyer will be responsible for any and all shipping costs. All shipping charges are NON-Refundable Any returns accepted must have all original packing and must be sent back in same condition as received .For your protection, we recommend that you use a traceable and insurable form for shipment. Fireside Diesel Parts & Performance LLC. will not be responsible for any items lost or damaged in the process of shipping.  Purchases not returnable: custom engine builds and special orders.



.Core Charge Policy: To receive full core credit, All cores must be returned by 30 days of date of invoice. All parts and engines must be the same part number and model purchased on original invoice. All cores must be in rebuild-able condition. All cores must be drained of all fluids. If fluids are not drained, purchaser will be responsible for all clean up and EPA charges and fines.



Limited Warranty Information: We offer a 30 day money back guarantee depending on product ordered  .



NO WARRANTY STATEMENT No warranty policy .Purchaser understands and recognizes that high performance engines , products (parts) and accessories sold by Fireside Diesel Parts & Performance LLC. are exposed to many and varied conditions due to the manner in the way they are installed and used. Fireside Diesel Parts & Performance LLC. Makes no warranties either expressed or implied including any warranty of merchantability or fitness for a particular purpose. Purchasers of our product(s) agree to accept full responsibility for any loss of Manufacturer warranty and or loss of product life cycle attributable to the installation and use of said product(s) Any work initiated without prior Authorization from Fireside Diesel Parts & Performance LLC will void all warranty. Fireside Diesel Parts & Performance LLC judges improper Failures resulting from any use or installation will void all warranty.  Failures resulting from accessory items, parts and add on pieces not recommended by Fireside Diesel Parts & Performance LLC.  May result in voided warranty. Failures resulting from abuse, neglect and /or improper repair and or install and overheating engine will result in a voided warranty.   Warranty is void if engine heat sensor is removed from engine. Warranty is void if tamper seal is broken. All used, new surplus and electrical parts, accessories & engines are sold as is no warranty.



ALL HIGH PERFORMANCE PARTS AND PRODUCTS ARE INTENDED FOR OFFROAD USE ONLY.


SHIPPING :

All shipping damage and loss items will have a claim done through the shipping carrier. We have no control over the shipping carrier once the package is in their care.


We pack accordingly to ensure the package arrives safely. All packages are covered with the limited amount of insurance provided by carrier


Any additional insurance will need to be added and extra cost collected before the package is shipped.


We truly appreciate your business.


Thank you for your purchase.