The Freightliner Leak Defender And Anti-Siphon is a 3-piece fuel tank adapter system designed to prevent fuel cap leaks and fuel theft. Made in the USA, this product includes a collar, fuel cap, and anti-siphon tube, and fits most Freightliner makes and models. By effectively stopping fuel cap leaks and preventing fuel theft, this product offers practical and reliable protection for your Freightliner vehicle. With its high-quality construction and easy installation, the Freightliner Leak Defender And Anti-Siphon is a must-have for any Freightliner owner looking to safeguard their fuel system.