Hi,
I have a rubbermaid sump and it has leaked twice. The problem is some rubbermaid tubes have little L shaped feet on the corners. On mine, the L feet inverted due to the weight and it cause it to leak. With some interesting duct tape and silicone, I was able to control the problem. To keep the bowing under control, I just place the rubbermaid top on the tub and drill hole in the top to get access to the tub.
Hope that helps.
- Victor.
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