Feature:1. Replacing part numbers for reference: 60930 and 2743809.2. Practical exhaust water shutter, fit for Mercruiser 2.5L, 3.0L and 3.7L exhaust system.3. Help keep water from running back into the engine under certain circumstances.4. Premium stainless steel and rubber, high hardness, anticorrosion and durable.5. Simple installation, does not require complicated operations and tools.Specification:Item Type: Exhaust FlappersMaterial: Rubber + Stainless SteelReplaces for Mercruiser Part #: 60930 & 27-43809Replaces for Sierra Part # 18-272Fitment: Fit for Mercruiser 120 (GM 2.5L, 153 cid, Inline 4) 6229718 - 0B531853 1983 - 1986 Fit for Mercruiser 2.5L (GM 2.5L, 153 cid, Inline 4) 0B531854 - 0C853255 1987 - 1989 Fit for Mercruiser 140 (GM 3.0L, 181 cid, Inline 4) 6229718 - 0B450800 1983 - 1986 Fit for Mercruiser 3.0L (GM 3.0L, 181 cid, Inline 4) 0B450801 - Up 1987 - Up Fit for Mercruiser 3.0LX (GM 3.0L, 181 cid, Inline 4) 0C856559 - 0K999999 1990 - 1997 Fit for Mercruiser 165 Hp (Merc 3.7L, 224 cid, Inline 4) 0B434941 - 0B774251 1987Fit for Mercruiser 170 Hp (Merc 3.7L, 224 cid, Inline 4) 6916779 - 0B434940 1985 - 1986 Fit for Mercruiser 180 Hp (Merc 3.7L, 224 cid, Inline 4) 0B436391 - 0B775248 1987Fit for Mercruiser 190 Hp (Merc 3.7L, 224 cid, Inline 4) 6916779 - 0B436390 1985 - 1986 Fit for Mercruiser 470 (Merc 3.7L, 224 cid, Inline 4) 6218037 - 6916778 1983 - 1984 Fit for Mercruiser 488 (Merc 3.7L, 224 cid, Inline 4) 6170297 - 6916778 1983 - 1984 Fit for Mercruiser 3.7L (Merc 3.7L, 224 cid, Inline 4) 0B774252 and up 1988 - 1989 Fit for Mercruiser 3.7LX (Merc 3.7L, 224 cid, Inline 4) 0B775249 and up 1988 - 1989.Package List:1 x Exhaust FlapperNote:Please double check the part number of your item, matching information is for reference only. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!