All gasoline-powered powerboats must have an approved backfire flame arrestor on each carburetor since boat engines tend to backfire. Flame arresters are used when there is a risk of an explosion caused by the mixing of combustible gas or vapor with air. The FLAME ARRESTOR 18-7228 is constructed of anodized aluminum hard surface and resists corrosion while enhancing appearances, resisting scratching, and resisting fading for years of trouble-free service. The FLAME ARRESTOR is USCG approved to ensure that no backfires create an unsafe condition in your engine compartment. It is reliable to build a safe atmosphere to avoid harm to machinery, loss of output, injuries to workers, and even fatalities. Key Features Fits: 4 and 6 Cylinder Engines For: 2bbl Rochester & MerCarb Carburetors Fits 2-barrel carburetors. Anodized Aluminum Flame Arrestor With (1) Vent Tube which accepts 5/8 inch ID Hose Coast Guard-approved flame arrestors Replaces 85784A1, 47-7228, 986865, 30999564566, 3099956456 Specifications BRAND: SEASTAR SOLUTIONS SKU:18-7228 UPC:030999564566 Weight:0.59 LBS Unit Of Measure:EA Height: 2.156 Throat: 3.12 Element: 1.088 Vent tube: 1 Element: 1.088, Height: 2.156, Throat: 3.12, Vent tube: 1, For: 2bbl Rochester & MerCarb Carburetors