18-2732 water shutter for MerCruiser marine sterndrive engines. Replaces Mercury marine parts number 807166A3, 14348A1, 14348, and 14348A2, Mallory 9-42802, and 89170.For 1982-1996 engines, there are some 1996 and 1997 models that apply. Fits the oval 4inch Y-pipes with round pin holes. If you have two rectangular holes for the grommets you will need the A1 water shutter. 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.Replaces Part : 807166A3 18-2732 14348A1 14348A2The replacement part is made from high quality material and well-tested by the manufacturer.Exhaust Water Shutter Flapper for 4 Inch Y pipe used on Mercruiser. Fits into the "Y" Pipe on most V-6 & V-8 engines to help prevent water from backing into the manifoldThese shutters are designed for the following MerCruiserCondition: 100% newColour:blackMaterial:ABSPackage Contents:2 x Exhaust Flapper Water ShutterOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.