Allison 1000 Spin on Filter Magnet, LB7 LLY LBZ LMM LML L5P, 2001-2018 Duramax

Allison installed a disk type magnet that mounts on top of the external spin on filter to catch metallic debris. Its very common for this magnet to get overlooked when servicing as it tends to stick to the top of the filter, only to get thrown away with the old filter.

This is the factory replacement piece.