I have to winterize my pool soon and I’ve been thinking about just making a short standpipe out of pvc I can put/thread in my skimmers that extends above the water level. This way I can blow the lines out and also be able to look in to make sure the pipe is sealed. The same idea as those Gizmos but much stronger and I can look in from above. I can then put a poly bottle (or something) in the skimmer to account for the expansion of ice. Anyone ever done this?