Description

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