Sierra's 18-4248-9 Drain/Fill Plug Washers are designed for use with Johnson/Evinrude outboard engines and OMC stern drives. Use with Sierra's 18-2387 Lower Unit Drain/Fill Screw. Constructed of durable plastic material. It is interchangeable with Mallory 9-60408, Volvo Penta 3852105, Johnson/Evinrude Outboard 311598, and OMC Stern Drive 311598 and 3852105. Each Sierra product meets or exceeds the original equipment part it replaces.