Coffee Appreciation

Right, I want to stop my steam wand from leaking.

Of the parts below, is it going to be the best idea to get everything, as in replacing a chain and a cassette at the same time, or are only some parts the "consumable" elements?

The tip of part 47 has corroded and no longer seals fully, hence the wand leaks steam when the machine is on.

If you can find just that part 47, i should do the trick when you replace it.
Not sure you can get spares for them though. I never looked.