The 8M0058391 sealing washers are made of rubber-coated stainless steel and fit Mercury and Mariner outboard engines, as well as all MerCruiser sterndrives with 3/8-16 threads for gearbox drain/fill plugs. They are essential for preventing water from entering the gearbox, which could cause severe damage. After changing the gearbox oil, replacement washers should be kept on hand, and when reinstalling the drain plug, always check that the washer is properly seated.
Product Features
Material: Rubber-coated stainless steel
Fits 3/8-16 threads for drain/fill plugs in outboard and sterndrive gearboxes
