Shop by Brand Mercury OutboardGasket/Gasket Kit Back Power Head Gasket Set 27-803663A99/803663A99 Viewer:320 OEM No.: 27-803663A99/803663A99 For MERCURY outboard 9.9, 15, 18 HP You May Also Be Interested In Gasket 27-853702005/853702005 Gasket 27-8537024/853702 4 Pinion Gear 338190/0338190(12T) Gasket, Exhaust Outer Cover 6H3-41114-A0-00