Basin wrench.
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Previously:
https://www.homemadetools.net/forum/...009#post149166
https://www.homemadetools.net/forum/...151#post145530
https://www.homemadetools.net/forum/...188#post145742
https://www.homemadetools.net/forum/...029#post145111
https://www.homemadetools.net/forum/...544#post132342