18-3714 or Mercury 12-31211A2
CASTLE WASHER - BRASS
Replaces Mercury 12-31211A2
This is the washer that goes on the front of the prop prior to the tab washer.
It is used on props which do not include the castle washer already built into the hub. It fits several Mercury's and all Mercruiser props.
Manufacturer: Sierra
SKU: 18-3714
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