The Tecumseh 40005 Piston Assembly is a genuine OEM replacement part designed for Tecumseh engines. This assembly features a .010 inch (0.25 mm) oversized piston, ensuring a precise fit for engine rebuilds or repairs. It includes the piston, rings, wrist pin, and retainers, providing a complete solution for restoring engine compression and performance. Manufactured to Tecumseh's original specifications, this piston assembly guarantees durability and reliable operation.