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Sierra replacement piston rings for Johnson/Evinrude Outboards.
Interchangeable with:
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
Sierra 18-3978 Mercury Piston Rings Sierra high-quality engine parts are designed to meet OEM specifications. Interchangeable with: Mercury Marine 39-15322M
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Sierra 18-4089 Piston Rings Sierra high-quality engine parts are designed to meet or exceed OEM parts. Interchangeable with: Mallory 9-54425
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Sierra 18-3915 Johnson/Evinrude Piston Rings Sierra high-quality engine parts are designed to meet OEM specifications. For use on Johnson/Evinrude Outboards. Bore Size: 3.217 / ...
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