Help identify hose on BOTTOM of F15 X5 coolant tank?

[james92se]

2015 X5 sDrive 35i

184k miles

I can't for the life of me seem to confirm what exactly the hose is that connects to the BOTTOM of the F15 coolant overflow tank. Lots of pictures online of hoses but with no corresponding parts diagrams that are detailed enough to be of use.

The coolant tank has developed a leak and while I'm replacing it I would prefer to replace the hoses too. The problem is I can't exactly identify the BMW description of the bottom hose.

Does anybody know a part number or can point me to a parts diagram that isn't frustratingly vague? My best guess at this point is 17127576370?

Thanks in advance!

[Tomcat_F15_STL]

https://www.realoem.com/bmw/enUS/sho...diagId=17_0783



It's a long hose with several connections.

[james92se]

I was only able to look at it in the dark for a few minutes with my cell phone light in a parking lot and would've never imagined it's that big hose.

I'll probably opt not to replace it then as I don't think anything is leaking on it. I assumed it'd be a ~$20-30 hose and that I'd just replace it while I was in there.

Thanks for the quick help!