Sierra 18-2831-9 Thermostat Cover Gasket for MerCruiser Stern Drives - 2-Pack

The Sierra International 18-2831-9 is a thermostat cover gasket engineered for MerCruiser stern drive engines, including Renault 90 and GM inline 4- and 6-cylinder applications. Sold as a convenient 2-pack, this aftermarket gasket is a direct replacement for Mercury Marine OEM part numbers 27-47590, 27-475901, and 27-47590B1.

Key Features:

• Engineered to meet or exceed original equipment manufacturer (OEM) specifications
• Machined to precisely match engine component mating surfaces for a leak-free seal
• OEM hole and port patterns ensure an exact, drop-in fit
• Backed by Sierra's industry-leading aftermarket warranty
• Sold as a 2-pack for added value

OEM Cross-References:

• Mercury Marine / MerCruiser: 27-47590, 27-475901, 27-47590B1
• Barr: MC47274790
• GLM: 31430
• Mallory: 9-60012

Sierra Marine has been a trusted name in aftermarket marine engine parts for over 50 years. The 18-2831-9 thermostat cover gasket delivers reliable OEM-level performance at an aftermarket value price, giving both professional technicians and DIY boaters confidence that the job will be done right the first time.