Sierra 18-3668 Thermostat Kit-Mercruiser V6 andV8

For use on Mercruiser Inboard/Outboard cooling systems. Part # 18-3668Contains:•(1) 18-2552 Thermostat Cover Gasket - replaces O.E.# 27-33179-2•(1) 18-2553 Thermostat Cover Gasket - replaces O.E.# 27-47510•(1) 18-2554 Thermostat Cover Gasket - replaces O.E.# 27-41812•(1) 18-3551 Thermostat - replaces O.E.# 59137•(1) 18-7173 O-Ring - replaces O.E.# 25-30224