What is this and where does it go!?

[jrandle]

How's it going everyone! I've been making some progress ironing out some issues with the D, but this is one that has got me baffled. The picture is a photo of someone else's engine, but, the hose that's circled in red has me confused. It is just dangling in my engine compartment and I can not figure out what its supposed to connect to. I have read all through my manuals and can not find it referenced. Any one have any ideas?

[jrandle]

Disregard this thread. This question was answered in my first post, but because I never received notification of replies I thought it failed to upload. Thank you all for your help though!