A 2-Piece Fuel Neck Adapter, Collar & Cap. Which Replaces Your Old, Worn Fuel Neck. Stops Leaking Fuel Caps on Kenworth Trucks Also Available for Peterbilt, Freightliner & Western Star & with an Anti-Siphon... The Leak Defender® is more than just a shiny new Kenworth fuel cap. Its a 2-piece fuel neck replacement system, consisting of a collar and cap, that stops fuel cap leaks for good!The collar creates replaces your old, worn fuel filler neck and creates a completely NEW sealing surface. And, yes, this will attach to a fuel neck where the threads are completely worn/stripped and fuel caps no longer seal. In fact, this is why we invented the product! It has an o-ring/rubber gasket underneath which seals to your existing fuel neck when tightened with a strap wrench and is securely fastened with set screws. Its sealed along the outer perimeter, away from the inner perimeter which is prone to wear and tear from everyday fueling. The fuel cap twists onto the collar, your new and improved sealing surface which is built to lastMade with the strength of billet aluminum. In under 5 minutes, you can say good-bye to constantly replacing your fuel cap, creating makeshift remedies or replacing your entire fuel tank just to stop fuel cap leaks. The item "STOP FUEL CAP LEAKS on Kenworth Trucks Leak Defender Collar + Fuel Cap" is in sale since Wednesday, March 7, 2018. This item is in the category "eBay Motors\Parts & Accessories\Commercial Truck Parts\Air Intake & Fuel Delivery\Fuel Caps". The seller is "soniabou" and is located in Mesa, Arizona. This item can be shipped to United States, Canada.