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Shutter Flapper Exhaust Y Pipe 3 Inch for Mercruiser 99370A2

  • MAL9-42801 is currently unavailable and is replaced by..
  • Part #: SIE18-2733

$24.95

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Water Shutter that was used on V-6 & V-8 Mercruiser applications with center riser manifolds from 1982 thru 1987 with the 3 Inch Diameter Y Pipe.

It's purpose is to keep water from backing into the Riser & Manifold and into the engine.

Many times you will hear a knocking sound near the back of the engine. This usually means the rubberized coating has worn or burned off which causes this sound.


Replaces Mercruiser 99370A2


SIE18-2733
Brand Model Year HP Serial # Notes
Mercruiser Stern Drive 185 2 BBL. GM 1985
Mercruiser Stern Drive 205 4 BBL. GM 1985
Mercruiser Stern Drive 185 2 BBL. GM 1986
Mercruiser Stern Drive 205 4 BBL. GM 1986
Mercruiser Stern Drive 200 2 BBL. GM 1982 200
Mercruiser Stern Drive 228 4 BBL. GM 1982
Mercruiser Stern Drive 230 4 BBL. GM 1982
Mercruiser Stern Drive 260 GM 1982
Mercruiser Stern Drive 260 4 BBL. GM 1982
Mercruiser Stern Drive 898 2 BBL. GM 1982
Mercruiser Stern Drive 200 2 BBL. GM 1983 200
Mercruiser Stern Drive 228 4 BBL. GM 1983
Mercruiser Stern Drive 230 4 BBL. GM 1983
Mercruiser Stern Drive 260 GM 1983
Mercruiser Stern Drive 260 4 BBL. GM 1983
Mercruiser Stern Drive 898 2 BBL. GM 1983
Mercruiser Stern Drive 200 2 BBL. GM 1984 200
Mercruiser Stern Drive 228 4 BBL. GM 1984
Mercruiser Stern Drive 230 4 BBL. GM 1984
Mercruiser Stern Drive 260 GM 1984
Mercruiser Stern Drive 260 4 BBL. GM 1984
Mercruiser Stern Drive 898 2 BBL. GM 1984
Mercruiser Stern Drive 200 2 BBL. GM 1985 200
Mercruiser Stern Drive 228 4 BBL. GM 1985
Mercruiser Stern Drive 230 4 BBL. GM 1985
Mercruiser Stern Drive 260 GM 1985
Mercruiser Stern Drive 260 4 BBL. GM 1985
Mercruiser Stern Drive 898 2 BBL. GM 1985
Mercruiser Stern Drive 200 2 BBL. GM 1986 200
Mercruiser Stern Drive 228 4 BBL. GM 1986
Mercruiser Stern Drive 230 4 BBL. GM 1986
Mercruiser Stern Drive 260 GM 1986
Mercruiser Stern Drive 260 4 BBL. GM 1986
Mercruiser Stern Drive 898 2 BBL. GM 1986
Mercruiser Stern Drive 200 2 BBL. GM 1987 200
Mercruiser Stern Drive 228 4 BBL. GM 1987
Mercruiser Stern Drive 230 4 BBL. GM 1987
Mercruiser Stern Drive 260 GM 1987
Mercruiser Stern Drive 260 4 BBL. GM 1987
Mercruiser Stern Drive 898 2 BBL. GM 1987
Mercruiser Stern Drive 185 4 BBL. GM 1983
Mercruiser Stern Drive 185 4 BBL. GM 1984


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