1Replacing part numbers for reference: 99370A2, fit for Mercruiser V6 V8 with 3in Ypipe 82-87. 2Marine grade stainless steel and rubber, it is corrosionresistant, sturdy and durable. 3The installation is simple and does not require complicated operations. 4Original standard, excellent replacement for the old or broken exhaust flappers. 5Built to meet standard specification, strictly follow factory quality control.Item Type: Exhaust FlappersMaterial: Rubber + Stainless SteelPart Number: 99370A2Cross Reference: 18-2733, 89160, 9-42801Mounting: Direct ReplacementFitment: Fit for Mercruiser V6 V8 w / 3in Y-Pipe 1982-1987Fit for V6 or V8 engine early model198/200/228/230/260 HP R/MR/ALPHA ONE198/200/228/230/260 HP R/MR/ALPHA ONE .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }1 x Exhaust Water Shutter