Sierra Thermostat Cover Gasket Gaskets & Seals

Sierra thermostat cover gaskets (also called thermostat housing cover gaskets or thermostat seals) are marine-grade replacement gaskets for outboard and stern drive engine cooling systems. A gasket like this is essential for keeping the cooling system working properly during repairs or maintenance. It seals the joint between the thermostat housing and its cover. That keeps coolant where it belongs and helps the engine hold its correct operating temperature.

Key Features:

• Precision-cut design: Sierra gaskets are precision cut to match the mating surfaces of engine components. This helps the job go right the first time.
• Built to OEM standards: Sierra aftermarket parts are manufactured to meet or exceed OEM requirements.
• Marine-ready quality: Sierra products are engineered to stand up in harsh marine environments.
• Cross-referenced: Each part number in the line is cross-referenced to OEM and aftermarket equivalents, so you can match your original gasket.
• Warranty: Every new Sierra part comes with a limited lifetime warranty against defects in workmanship and materials.

Sierra is a trusted name in marine aftermarket parts. The brand offers premium-quality replacements for over 6,000 marine parts, tools, and components. Use these gaskets when you service the thermostat or the cooling system. Choose the part number that matches your engine's thermostat housing.