Yamaha - Crankcase assy - 6H4-15100-30-1S Sierra Gaskets - O-Rings - Seal Kits Performance: Protects your lower unit

Performance: Protects your lower unit and exposed metal parts from electrolysis damage

You’ll notice how confidently your system behaves when everything is properly protected—no flickers

It is commonly used in Yamaha marine and recreational engines where consistent lubrication is critical for performance and long-term reliability

verify fitment using your outboard’s serial number or consult your model’s compatibility guide

Yamaha - Crankcase assy - 6H4-15100-30-1S Sierra Gaskets - O-Rings - Seal Kits Performance: Protects your lower unit6H4 15100 30 1S 6H4 15100 30 00 WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings. ca. gov.