What is this hose for?

Hi all, I have a leaking fuel hose, runs from the bottom outlet of the carb to a metal bracket mounted next to the transmission/airbox with a screw in it, like a plug I guess. I've ordered a replacement, just wanted to know what exactly that hose does, some sort of bleed hose if the carb is flooded, or what?







Cheers.

 

It's the carb float bowl drain pipe.

 

Thanks very much Marsh.