Aftermarket Thermostat Kit, With Gasket 27-824853 Temperature Rating: 140°F / 60°C Tested Before Shipment to Ensure High Performance & Efficiency High Quality Thermostat Keeps The Motor At Its Ideal Operating Temperature Replacement for Most Mercury Mariner Outboard 4 Stroke 8HP - 90HP Engines Upgrade your Mercury 4-stroke outboard engine's cooling system with our high-quality Marine Thermostat Kit. This aftermarket kit, complete with a gasket (27-824853), ensures optimal engine performance by maintaining a consistent temperature of 140F (60C). Manufactured by AIPICO, this thermostat kit is designed to replace most Mercury Mariner outboard 4-stroke engines ranging from 8 to 90 horsepower. Engineered for manual operation, it mounts directly onto your engine, providing reliable and efficient temperature control. Before shipment, each kit undergoes rigorous testing to guarantee high performance and durability.