The Freight Defense 100308 Locking DEF Cap is a specialized security accessory designed to fit Hino and Isuzu vehicles, offering enhanced protection for your Diesel Exhaust Fluid (DEF) system. This locking DEF cap features a keyed-alike mechanism, providing the convenience of using a single key for multiple caps, which is particularly beneficial for fleet management. Constructed from high-quality, durable materials, the Freight Defense locking cap ensures a secure seal, preventing contamination and unauthorized access to your DEF tank. Easy to install and user-friendly, this cap is an essential addition for those looking to safeguard their vehicle’s DEF system from tampering and theft. By maintaining the integrity of your DEF supply, the Freight Defense 100308 Locking DEF Cap helps ensure your vehicle remains compliant with emission standards and operates efficiently