Sierra International 18-2844-9 Thermostat Gasket - Pack of 2 Sierra Thermostat Gasket Meets or exceeds the original equipment quality Sierra part number: 18-2844-9 Interchangeable with the following: Barr MC472748818, GLM 31510, Mallory 9-60010, Mercruiser 27-488181, 27-48818Q01, 27-48818