Thermostat 'connection' alloy housing, for DB2 to MkIII, fits to top hose & bolts to alloy thermostat  housing via 4 studs, often called 'Pigs Snout', with 4 bolt holes, Polished as original. can be supplied in 'as cast' for Race / Rally cars, as 'original' housing

also called Connection, Thermostat Housing