Mercury - Quicksilver Prop Washer Propeller Hardware Stainless Steel 161402. Overview. You don't notice a good prop washer until you need one. The Mercury Marine 161402 Quicksilver Prop Washer does its job quietly - holding your prop tight, transferring every bit of power, and keeping the system running smooth. Built from hardened stainless steel, it's made to take years of torque, vibration, and saltwater without bending, rusting, or losing its grip. It's one of those small parts that make a bi