On my 07 they are clearly visible from the door side of the unit; in fact you see them even if you are not looking for them. If you don't have any.....in my opinion that would be a good thing. In my unit they do not drain the the lines completely which is obvious when I pump antifreeze into the lines it pushes a significant amount of water out even after draining the low point drains first. Apparently there are low areas in the line routing that traps water in the lines. If you winterize using antifreeze you do not need the drains as you push all of the water out through the faucets, commode, shower, etc. The low point drains as they have been designed in our units creates a vulnerable area for freezing as they are exposed to the elements without any shutoff valves in the heated area. There have been many post on this forum relative to line freezing from the low point drains.
