automatic regulator valve from the pool skimmer hole. I installed this when I just bought the kk years ago but I never needed it since I use the plate over the skimmer baskekt. Now I want to remove it to increase the flow. I think it's threaded but I don't remember if the skimmer hole was threaded, I might have just pushed it in. I used duct tape to wrap around the end of the pole to make a cone shape, pressed into the hole and turn at the same time but it wouldn't move budge even with that much torque.
Do most skimmer holes have threads? Any idea or available tool to remove this?