Sierra 18-2375 Drain Plug (Magnet) Use with Drain Screw Gasket 18-2945 Thread Size: 3/8" Sierra part number: 18-2375 Interchangeable with the following: Chrysler 2267892A1, 22-67892, GLM 21731, Mallory 9-72651, Mercruiser/Mercury 10-14834, 10-14834A1, 22-67892, 22-67892A06, 22-8M0058389, 22-67892A1