2.5 LITER. Separator bolt. A screw that is used to secure the Fuel Evaporative Emission Control Vapor Separator to it's mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Fuel Evaporative Emission Control Vapor Separator to its mounting surface. Engine Coolant Thermostat Housing Bolt. HEX. HEAD. hsng. outlt. Engine Coolant Housing. Separator. Vapor Canister Purge Valve Assembly Screw. Water outlet.