The Diesel Anti Siphon Device is a practical solution for Class 7 and 8 trucks, specifically designed to prevent fuel theft. Its 4mm thick aluminum side walls and 2.25-inch fill neck ensure durability and easy installation without the need for drilling or riveting. Once installed, it requires no maintenance. This device allows for hands-free filling without splashback, making the process efficient and hassle-free. Tested on high flow pumps filling up to 50 gallons per minute, it guarantees reliable performance. Sold individually, it fits most Freightliner and Sterling models, providing a secure and convenient solution for truck owners.