What material is the thermostat housing on the Vauxhall engine?
On recent Ford engines it is plastic and uses an elongated O-Ring as a seal rather than a gasket. Worth checking as you will need a new seal if similar to Ford.
Yep, it's the same arrangement. Supposedly the new thermostat comes with the seal but I have the part number if it doesn't. The thermostat itself is integrated with the top section of the housing along with the temp sensor and is alloy, but the main body that mounts to the engine is plastic for some reason, probably cheaper as it would be quite an intricate casting.
