I bought it to mount on the water tank on wheels to have access to clean the tank. After assembly with butyl putty and stainless steel screws, I filled the tank with water and tested this board for leaks - success! The reason I gave it 4 stars vs 5 is because the outer ring isn't that rigid and I'd like to see that, and there was a little flex when I screwed it on, but it works.
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