Delonghi ECAM23 450 water leakage, damaged pipe connection

Delonghi ECAM23 450 water leakage, damaged pipe connection. How to find problem and fix it.
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[@runesolheim2282]

Thanks for the vid. Do you have the name of the part or a link to where to get it?

[@abdelmoniemhegazy3149]

DeLonghi Dinamica milk frother not working after descale , can you please help

[@fankaria1]

What's the part name that is being replaced?

[@user-se4wu5yw7u]

Can i get part name please?

[@px3m]

I think he simply replied the O ring.