Pair of Exhaust Flappers Water Shutters For Mercruiser 1998 & Up 807166A1
For 1998 and newer engines, there are some 1996 and 1997 models that apply. There will be two rectangular holes for the grommets. If your Y-pipe has round holes you need the A3 water shutters. If your Y-pipe changes size a few inches bellow the shutter you have a one piece manifold V6 Y-pipe and need shutter A2.
If you have ever overheated these tend to get damaged. Sometimes you will find pieces of them in the exhaust when you remove the drive for servicing. They help keep water from entering the engine through the exhaust.
For the Kit that includes the upper and lower exhaust bellows see:
Exhaust Y-pipe Kit 807166A1 Hose Bellows 32-14358T , 32-44348T for Mercruiser Sierra
This is for a set of 2 flappers