ᐅ Piece of the old Atlant trap at the sink overflow

Hello,

I had my kitchen installed in my new apartment, and the more I look at it, the more I notice that the kitchen fitter (not from IKEA) made some mistakes. For example, he installed the sink and attached the new Atlant siphon, but left the outlet connected to the overflow opening from the old Atlant siphon. In theory, I could replace it, but I can’t remove it because the sink is already installed and sealed to the countertop with silicone.

Is there a way to use the old connection at the overflow with the new Atlant siphon or possibly connect this white hose to the new one?

I would be very grateful for any help. I really don’t want to remove the entire sink again.

Best regards,

Hans