172 Ph1's have this
Ph2's have a rubber O ring which is reusable.
^ Pikey method
It works though as long as its done properly i.e not bunging loads of the stuff on there!
I was getting fed up of needing a new gasket almost every time I took the TB off to clean it as they seem to stick and rip when you remove them.
it is just 4 bolts and a sensor plug to take off?