Not sure what it is? Or what it does.

[FREAKS720]

Hello, looking for some help on a issue i'm having with a 85 Kc i just picked up. Trucks been sitting for i don't know how long. So messing with i get it started but wont run at idle, no biggie there. However i did notice water dripping from the bypass hose and on a spot under the excahst manifold. What i want to know , what is that tube/hose sticking up right there and where does it go? Is it part of the cooling system? I would like to fit it but can't untell i know what it is. This is my 5th 720 and never had this issue before. Any help would be great cause i've looked for it and can't find anything on that tube/hose.

[dreadsiren]

can you post a pic of said hose/leak? my mind just isnt seeing it... I know there are 3 hard lines there but none to the coolant