Worn or scored thrust washers can cause damage to your prop shaft and propeller face. Protect your drive system by changing your thrust washer when replacing or inspecting your propeller. This forward thrust washer is for use with Nissan/Tohatsu Outboards, 3" Gearcase, 25-30 HP; Mercury Outboards, 3" Gearcase, 25 & 30 HP 4-Stroke (Not Bigfoot). For use with Nissan/Tohatsu/Mercury 25-30 HP | Thrust Washer For Nissan/Tohatsu/Mercury 25-30 HP