Well just to keep it short and sweet I need a part for a 2017 Suburban premier.I been to a couple of auto parts stores and none of them have it. All I know its some sort of connector for a coolant reservoir hose just not sure what's it called or how to ask for it. i attached pics and circled where it is. Thanks in advance and Happy Holidays.

Connector for this hose

 

I'd just replace it with heater hose.

 

Metal pipe and hose clamps would be my hose splice. Measure inside diameter of hose and go from there. Since it's under cooling system pressure any brass or metal nipple would work just fine.
If you run the GM part number on the hose assy. you can price out the part from the dealer.

 

Auto parts stores have hose connectors in various sizes, stuff like this https://www.oreillyauto.com/detail/c...nnectors&pos=9