Sierra 18-42481-9 Lower Unit Drain/Fill Plug Washer Pack of 50

The Sierra 18-42481-9 is a bulk pack of 50 replacement drain/fill plug washers engineered for use on Johnson/Evinrude outboard engines and OMC stern drives. These washers seat against the lower unit gearcase drain and fill screws to create a reliable, leak-free seal during routine lower unit oil changes and maintenance.

Key Features:

• Sold as a package of 50 washers — ideal for shops and high-volume maintenance
• Constructed of durable plastic material for long-lasting sealing performance
• Designed for use with Sierra 18-2387 Lower Unit Drain/Fill Screw
• Meets or exceeds original equipment specifications
• Direct replacement for OEM and cross-reference part numbers

Cross-Reference Part Numbers:

• Johnson/Evinrude Outboard: 311598
• OMC Stern Drive: 311598, 3852105
• Volvo Penta: 3852105
• Mallory: 9-60408

Sierra International is a leading manufacturer of marine replacement parts. Every Sierra component is engineered to meet or exceed the performance of the original equipment part it replaces, making this bulk washer pack a dependable choice for fleet maintenance, marine service centers, and dedicated boat owners.