12-31211Q03 ? Mercury THRUST WASHER & CONT.WASHER

Genuine Mercury-Mercruiser propeller thrust and continuity washer (12-31211Q03) for the splined propeller shaft. This OEM washer seats the propeller on the shaft and maintains electrical continuity for the anti-corrosion system; it supersedes 12-31211, 12-31211A2 and 12-31211A3, and fits Mercury/Mariner 135-275 HP and MerCruiser Alpha One and Bravo One drives using old-style rubber-hub propellers.