Mercury - Quicksilver Prop Washer Propeller Hardware Stainless Steel 161409. Overview. When you're running your boat hard, every part in the driveline has a job to do - even the small ones. The Mercury Marine 161409 Quicksilver Washer is a simple but essential piece that keeps your propeller secure and your power steady. Made from tough, marine-grade stainless steel, it spreads the load evenly across the prop hub and nut, locking everything down tight. It's built to handle years of torque, vibra