Upgrade your fuel system with the Cummins 3937142 Copper Washer Fuel Injector Seal. This direct-fit replacement seal ensures a precise factory fit and reliable performance. Crafted from premium copper, it offers exceptional durability and resistance to high pressure, making it ideal for demanding applications. Whether you're maintaining or repairing your 5.9 Cummins engine, this seal provides a dependable solution for a tight, leak-free fit. Trust Cummins for quality that meets and exceeds factory standards.