Leaking Line from Radiator

[xckyle]

Does anyone know what the attached line is.  What type of line, what type of fluid is leaking.  Is it a concern and should it be replaced?   Where could I find a replacement?

 

2011 GMC Sierra 5.3 Liter.  HardLine coming from passenger side.

 

Thanks for the help.

[rjgti]

trans cooler by the look of it

[tlaw91]

It’s a trans cooler line

GM tech


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[William Christopher Speight]

transmission line...it may not be seated properly.

[CapitalTruck]

It leaks where the rubber is spliced in.  On my 2wd I replaced with factory part and 4 years later it leaked again.  On my 4wd I said screw it, used a dremel tool to cut the steel line above and below the rubber flex hose and just put 11/16 trans line secured by hose clamps in its place.  So far so good.