Shop by Brand Mercury OutboardGasket/Gasket Kit Back Power Head Gasket Set 27-803663A99/803663A99 Viewer:307 OEM No.: 27-803663A99/803663A99 For MERCURY outboard 9.9, 15, 18 HP You May Also Be Interested In Gasket 27-823142-2/823142 2 Gasket, Elbow Exhaust 27-18272/18272 Carburetor Repair Kit 67D-W0093-01-00 Gear, Forward 346-64010-0/346640100M/346-64010-1/346640101M(23T)