Fire hydrant wrench.
https://diqn32j8nouaz.cloudfront.net...b_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...1_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...277#post192208
https://www.homemadetools.net/forum/...734#post190282
https://www.homemadetools.net/forum/...003#post171884
https://www.homemadetools.net/forum/...422#post154672
https://www.homemadetools.net/forum/...281#post146162
