Should just be the pad seal in the tap, usually pretty straightforward to dismantle. If you can get the seal out without destroying it you can just turn it around and reinstall.
Edit, not that straightforward it turns out, but doable. Good guide here. https://singletrackworld.com/forum/topic/gaggia-classic-owners-leaking-steam-valve/
Cheers Steve. I think I might have to just continue with the occasional hot drip on my wrist while I check the temp of the jug.
@Sam started
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Should just be the pad seal in the tap, usually pretty straightforward to dismantle. If you can get the seal out without destroying it you can just turn it around and reinstall.
Edit, not that straightforward it turns out, but doable. Good guide here.
https://singletrackworld.com/forum/topic/gaggia-classic-owners-leaking-steam-valve/