Hi Gary,
Are you sure the drain valve is opening up all the way? You may need to remove the valve and associated piping, to try and determine if the clog is right there (at the drain valve) or higher up. If you remove some of those plumbing angles, maybe you can see up into the piping/tank and determine the source of the clog.
Sean
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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