The Leak Defender® + Anti-Siphon is more than just a shiny new Freightliner fuel cap….it is a 3-piece fuel neck replacement system that stops fuel cap leaks for good! It consists of a collar and cap, which creates a completely NEW sealing surface and replaces your old, worn fuel filler neck. And an anti-siphon which helps to prevent diesel fuel theft.
The collar has an o-ring/rubber gasket underneath which seals to your existing fuel neck when tightened and is securely fastened with set screws. It is 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 last…made 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.
NOTE: If you have dual tanks, you will need to purchase 2.