Thermostat Kit 6.0L Crusader Series#28 in image. The RF026010 02B Crusader Series Thermostat Kit is a direct replacement kit designed specifically for Crusader 6. 0L marine engines. This high quality kit includes the thermostat and all required gaskets to ensure a proper seal and consistent engine cooling performance. Built to withstand the demanding conditions of the marine environment, this kit helps maintain optimal engine temperature for improved efficiency and longevity. Features: