Coolant line: can someone tell me what this part is called?

[at88mph]

My 03 Expedtion 5.4 has a miss and I found out that the bottom of that round piece is leaking coolant. Wanted to replace it along with a set of coils and plugs but can't find out what its called.


Thanks in advance for any help!

 

[Hamfisted]

Hot water control valve.

Motorcraft YG-368 at Rock Auto





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[at88mph]

PERFECT!!! Thanks so much for the help!!!!