I checked the manual and it said it was a carburetor drain hose, I would say it is to drain your bowl of gas before you remove it. Most carbureted engines have them.
2009 700 xtx
alum skid plates (fabrication by me)
rear bumper (fabrication by me)
front brush gard (fabrication by me)
crow harnes (4 point)
lower tail light
epi clutch kit
full wind sheild
e brake alarm (utv crap)
sound proof engine cover
trail armor doors
rear sound bar
stage 1,2&3 clutch work by ///AIRDAM
Stock roll cage lowered 3"