Usage Tips:Precise fit for BMW diesel engines: specifically designed for M47N2 and M57N2 engines in E60, E61, E70, E83, E87, E90, E91, E92, and E93 models. The plug mirrors the EGR system structure for a onestep installation with no modifications, offering compatibility versus universal kits. Engineered to standard EGR port dimensions for these models. Complete tool set: includes all required tools for EGR removal, plug installation, and cooler spring operation. One provides everything you need, reducing the need for multiple orders and simplifying maintenance. Performance and sealing: the plug fully seals the EGR circuit, helping reduce carbon deposits, improve fuel efficiency, lower longterm risk of engine failures, and restore a responsive driving experience. Durable construction: built from strength metal with a corrosionresistant rubber seal, designed to withstand temperatures and wear in harsh engine conditions. Use scenarios: During EGR removal/maintenance on the listed BMW diesels to simplify reassembly and prevent leaks. After EGR cooler service, to seal the EGR path and maintain performance when the EGR system is not in use. In fleets operating in hot climates or heavy traffic, to curb carbon buildup and preserve efficiency and reliability.