I purchased a gizmo with attachment to blow out my lines. My skimmer has two openings in the bottom that are eccentrically placed. The gizmo's neck is not long enough to allow it to screw in as the wider part of the gizmo hits a plastic rim that is too close to the return opening. I don't have a pool store near me. Is there some sort of threaded extension that has a male and female end that will raise the gizmo an inch or so? Why would there be two openings? Do they come from the factory like this or did my installer drill the holes? Fortunately we haven't had many nights below freezing and the days are around 50 degrees but I am getting concerned about properly winterizing.