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You mean the group head gasket? I followed @dubtap's lead and got the silicone Cafelat...
Just got one too. Poxy not Gaggia rubber one swelled up to the point I could hardly get the portafilter in. That resulted in pretty much a whole batch of espresso shots ruined before I realised what it was doing and I was busy blaming the coffee. Then it yielded, now the handle goes almost all the way round to the other side and doesn’t seal. Grrr.
You mean the group head gasket? I followed @dubtap's lead and got the silicone Cafelat... It's been great, the last rubber one I put in lasted less than six months... I bought two of these!