Sierra 18-9794 Gear Lube Adapter for Outboard Lower Units

The Sierra 18-9794 Gear Lube Adapter is an essential marine maintenance accessory designed to simplify lower unit gear oil changes on outboard motors. This universal adapter connects Sierra quart pumps or lower unit fill tubes directly to the gearcase drain and fill ports, making gear lube service quick and mess-free.

Key Features:

• Compatible with Nissan, Yamaha, Honda, and Tohatsu outboard lower units
• Metric 8-1.25mm thread size for secure fitment
• Works with Sierra quart oil bottle pumps and lower unit fill tubes
• Allows direct pumping from gear lube bottles or containers
• Durable marine-grade construction for saltwater and freshwater use

This adapter replaces Mercury Marine OEM part number 91-883704Q03 and Mallory 9-81003. Essential for proper lower unit maintenance, this adapter ensures clean, efficient gear oil changes without spills or waste, helping protect your outboard's critical gearcase components from wear and corrosion.