question regarding winterizing TT-Oil-less compressor?

aftermath- thanks for the reply. I am concerned about winterizing my tank flush system because my owners manual says to do it. I am not concerned about using my NON oil-less compressor, as it just goes to sh**t tank, and I wouldn't care if oil got in there anyways. lol.
But I am wondering if I need to even blow out my city water connection? Or are they self draining?