2001-2004 LB7 Duramax Injector Screw In Torque Lock CupsThe factory injector cups are known for leaking, pitting and seizing themselves to the injectors in your LB7. If you are looking to ensure proper sealing and increased reliability the screw in style Torque Lock injector cups are a great long term upgrade for your LB7 cylinder heads. This is a replacement set of Torque Lock Cups if you already have the install hardware. Includes: 8 Torque Lock Injector Cups 16 Injector Cup O Rings For the full LB7