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Depends on the specific type of tub but they can very quickly get over 300lbs.
I have thrown out my back moving them out when they were broken into two pieces so they are not light. Some run as heavy as 500lbs+
They start at 250/260 lbs and go up from there. I haven't run into any over 500lbs, but I'm sure they're out there.
I agree, 300+ is typical.
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