There is a port built into the valve cover below the oil fill hole. there is a rubber hose attached to the port. Where does this hose go and what is it for? Mine has been replaced with a piece of red generic hose but it's too cold to take the intercooler off to determine where it goes so that is why I'm asking.

I did a search to try and find the answer to my question but came up empty...maybe searching for wrong thing.