Adapter Gear Lube Fill Metric | Sierra 18-99531
Adapter Gear Lube Fill Metric | Sierra 18-99531
Sierra
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Adapter Gear Lube Fill Metric | Sierra 18-99531
Adapter Gear Lube Fill Metric | Sierra 18-99531
Metric gearcase lube fill adapter designed for 8mm applications across Honda, Nissan, Tohatsu, Yamaha, and select Mercury and Evinrude outboards. Features 8mm x 3/8-16 threading for secure, leak-free lubricant filling. Direct replacement for Mercury 91-883704Q03, 91-883704K03, and 551-33M, plus CDI equivalents. Not compatible with Suzuki models. Essential maintenance tool for keeping your outboard gearcase properly lubricated and protected.
- 8mm tip fits most Honda, Nissan, Tohatsu, Yamaha, some Mercury & some Evinrudes
- Does not fit Suzuki
- 8mm x 3/8-16
- Replaces Mercury 91-883704Q03, 91-883704K03, 551-33M
- Replaces CDI
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
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