The Hino and Isuzu DEF Cap Defender-Keyed Alike is a practical and convenient solution for protecting your diesel exhaust fluid. This corrosion-resistant cap is vented and comes with 2 single-sided cut keys, allowing for multiple keys to be ordered with the same key code. This feature prevents tampering and possible contamination of the fluid. Please note that this product is not compatible with the vehicle's ignition key and is sold individually. It fits most 2010-2016 Hino and Isuzu trucks, making it a reliable and essential accessory for truck owners.