I have a question concering winterizing an inground vinyl lined pool.
I removed the eyeballs from the filter returns and want to install the winter plugs. After I removed the eyeballs, the returns now have a large male threaded section. The plugs have a smaller male threaded section. I know these have worked before because I had the pool winterized professionally last year. There are outer covers around the threaded sections but it looks like there are screws going through them, so I cant imagine that I would want to remove them. If I feel inside the fittings I can feel a female threaded section that would fit the plugs but they are too far in to reach the threadson the plugs. Do I need to remove these outer collars? Will I be ripping through the liner if I try this.
Your help is greatly appreciated.