The Peterbilt 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 individually. Designed to fit most Peterbilt makes and models, this product is made in the USA. With its simple yet effective design, the Peterbilt Leak Defender ensures a secure and leak-free fueling experience. Say goodbye to fuel cap leaks and enjoy peace of mind on the road with this high-quality product.