Quick Help - Identify this pipe no.

Hi all, thanks in advance as I just dont want to loose anymore coolant while hammering this amazing car around the moors.



Just had to cut and shut the coolant pipe coming from the engine to the top branch indicated here (not my picture) as had a small tear that would leak on high pressure -







Can you tell me which part this is as I could do with it being replaced asap.



It is a 160 VVC, and is only a short pipe that connects to a 'y' piece.



It is very tight for the time being against a sensor on the exit pipe.

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