Shop by Brand Mercury OutboardGasket/Gasket Kit Back Power Head Gasket Set 27-803663A99/803663A99 Viewer:321 OEM No.: 27-803663A99/803663A99 For MERCURY outboard 9.9, 15, 18 HP You May Also Be Interested In Power Head Gasket Set 27-898101928/898101928 Gasket 27-822844-1/822844 1 Propeller Shaft 57600-93901-000/57610-93901-000 Spring, Drive Pawl 677-15705-00