The Mack 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. Made in the USA, it fits most Mack makes and models. With its innovative design, this product effectively stops fuel cap leaks, ensuring a secure and leak-free fueling experience. Trust the Mack Leak Defender to provide peace of mind and protect your fuel tank from potential leaks.