Sierra 18-3609 Yamaha Thermostat Kit Sierra high-quality engine parts are designed to meet OEM specifications. Temperature Rating 122F50C Kit Contains 1 18-0829 Cover Gasket 1 18-3540 Thermostat Interchangeable with Mallory 9-43038 9-43178 California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Engine Parts Wiser Yes Product MPN 18-3609 Product UPC 808282256821 Fast Ship In Stock Ships Today