The Freightliner Leak Defender is a practical and reliable solution to prevent fuel cap leaks. This 3-piece fuel tank adapter system includes a collar, fuel cap, and sealing insert, all sold separately. Designed to fit most Freightliner makes and models, this product is made in the USA and ensures a secure and leak-free fueling experience. With its high-quality construction and easy installation, the Freightliner Leak Defender provides peace of mind and long-lasting performance. Say goodbye to fuel cap leaks with this essential accessory for your Freightliner.