3678611 Threaded Plug

This 3678611 threaded plug, with interchangeable part number 3678605, is purpose-built for Cummins 5.9L, 6B, 4B, ISM, ISX, K19, and L10 series engines. Precision-machined from high-strength steel with perfectly formed NPT threads and a corrosion-resistant finish, it ensures a tight, leak-free seal with the engine block, cylinder head, and fluid system ports. The plug prevents fluid loss, dust entry, and contamination of the engine's internal components, while its easy-to-install design requires no special tools. It is a reliable replacement for worn or damaged plugs during routine engine maintenance and repairs.