Originally Posted by cre10
That's just the concave shape of them. They've always been that way. Are most flat on the bottom?
They do have a shape to them to route the liquid to the dump valve. They are thinner at the end farthest from the valve and thicker in the center at the other end. Kind of "boat hull" shaped.
Your tanks look like a bloated whale found on a beach.
The top one looks OK but the other one is weird looking to me...
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