JLM MARINE 79953Q04 Lower Gear Lube fill hole screw for Mercury MerCruiser 2PCS, Used with 3/8-16 drain & on all sterndrives, and Mariner outboards except the Verado series

This set of 2 lower unit drain plugs and these drain plugs do not have magnetic properties They serve as versatile replacements for various Mercury drain plug models, including 10-79953Q04, 10-79953Q2, 10-79953A2, 79953Q04, 79953Q2, 79953A2, F50109, 816610A1, 79953, F40109, 816610A2, 28634A1, 28634, 20259, Sierra 18-2244, and Mallory 9-72650 These drain plugs are compatible with a range of Mercury and MerCruiser marine engines, including Mercury 3 Cyl EFI models with 30, 40, 75, 80, 90, 115, and 125 HP, 4 Cyl EFI models with 40, 50, and 60 HP, 6 Cyl Pro XS models with 175, 200, 225, and 250 HP, as well as MerCruiser engines with 1.5, 2.5, and 3.0 L displacement. They help prevent gear lube from leaking out and water from seeping into the gear case, which could otherwise cause serious damage to the engine and its components. To use these drain plugs, you simply pump oil into the bottom plug until it flows out of the top plug. After ensuring proper lubrication, you screw the top plug in tightly, and then quickly secure the bottom plug to minimize oil loss. This straightforward process simplifies routine maintenance tasks for your boat's lower unit.