Engine Coolant Thermostat (7.8751) by Facet®. Facet products are designed, manufactured, and tested internally and the external works are entrusted to selected partners that operate in an integrated manner with Facet processes, following Facet standards, and using technologies and systems supplied by Facet. This is the only way Facet can ensure to those who choose Facet spare parts a quality equal, if not superior, to that of the original components, at competitive prices.