Description

Sierra’s 18-3553 Thermostat is designed for use in Mercury marine applications, providing a dependable replacement option for maintaining proper engine operating temperature. It is interchangeable with GLM 13010, Mallory 9-43019, and Mercury Marine part numbers 62981, 66850, 75692, and 75692B, making it a versatile solution for a range of compatible systems. With a temperature rating of 143°F, this thermostat supports consistent cooling performance and helps ensure stable engine operation in marine environments. Each Sierra product is engineered to meet or exceed the original equipment specifications it replaces, delivering reliable quality and fit.

Features

Designed for Mercury marine applications requiring dependable temperature regulation
Interchangeable with GLM, Mallory, and multiple Mercury Marine OEM part numbers
143°F temperature rating supports consistent engine operating performance
Built to meet or exceed original equipment specifications for reliable replacement quality
Suitable for a wide range of marine cooling system configurations
For Mercury Marine engines
Premium quality for longer life
Meets or exceeds manufacturer specs
Backed by Sierra’s limited lifetime warranty