Description
Sierra’s 18-3561 Thermostat is designed for use in Johnson and Evinrude applications, providing a reliable replacement solution for maintaining proper engine operating temperature. It is interchangeable with GLM 131550, Johnson/Evinrude Outboard 436195, and Mallory 9-43023, offering broad compatibility across commonly serviced outboard systems. With a temperature rating of 143°F, this thermostat helps support consistent cooling performance and stable engine operation in marine environments.
Features
- Designed for use in Johnson and Evinrude outboard engine applications
- Interchangeable with GLM 131550, Johnson/Evinrude Outboard 436195, and Mallory 9-43023
- 143°F temperature rating supports consistent engine cooling performance
- Helps maintain stable operating temperature for reliable marine engine function
- Suitable for replacement use in compatible outboard cooling system configurations
- Temperature Rating: 143°F
- For Johnson/Evinrude Outboard
- Premium quality for longer life
- Meets or exceeds manufacturer specs
- Backed by Sierra’s limited lifetime warranty






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