Lower Unit Gear Oil Filler Adapter Kit | Sierra 18-99525

Lower Unit Gear Oil Filler Adapter Kit | Sierra 18-99525

Lower unit gearcase lubrication oil filler adapter kit engineered for multi-platform marine drivetrain compatibility. This comprehensive adapter assembly accommodates a broad range of outboard and inboard-outboard gearcase designs from leading manufacturers including Mercury, Mariner, MerCruiser, Johnson, Evinrude, Yamaha, Suzuki, Tohatsu, Volvo Penta, Chrysler, and Force. Kit includes five precision-threaded adapter components: metric M8 x 1.25P thread adapter (551-334M), Suzuki-specific M10 x 1.25P adapter (551-334S), Volvo Penta M10 x 1.5P adapter (551-334V), 3/8 x 16P threaded nozzle adapter (551-33TN), and unthreaded nozzle adapter (551-33UN). Compatible with Sierra fill pump assemblies 551-33-1, 34PV, and 551-34HA. Bravo and Verado adapter hose available separately. Direct replacement for CDI 551-334K.

• Includes 551-334M metric M8 x 1.25P thread adapter
• Includes 551-334S Suzuki M10 x 1.25P adapter
• Includes 551-334V Volvo Penta M10 x 1.5P adapter
• Includes 551-33TN threader 3/8 x 16P nozzle adapter
• Includes 551-33UN unthreaded nozzle adapter
• 551-334B Bravo & Verado adapter hose sold separately
• Compatible with 551-33-1, 34PV & 551-34HA
• Replaces CDI 551-334K