Mercury – Quicksilver Water Shutter | For Select MerCruiser Sterndrive Engines | 807166A1 Mercury Outboard Gear Lube Kits a dependable drain plug makes

a dependable drain plug makes the job easy

or covers are also needed

The MKA-21 features a sleek black finish tailored for freshwater bass and aluminum fishing boats to match black trolling motor bases

nuts and washers

Brightly colored for greater visibility (Remember to remove propeller stop before using your boat)

Mercury – Quicksilver Water Shutter | For Select MerCruiser Sterndrive Engines | 807166A1 Mercury Outboard Gear Lube Kits a dependable drain plug makesMercury Quicksilver Water Shutter For Select MerCruiser Sterndrive Engines 807166A1 Overview A small part with a big job, the Mercury Marine 807166A1 Quicksilver Water Shutter helps keep water where it belongs out of your engine. Designed for select MerCruiser sterndrive and inboard engines, this shutter sits inside the exhaust system and acts like a one way valve. When your engine is running, it allows exhaust gases to flow freely. When its idling,