Ratcheting flare nut wrench.
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More: https://tribustools.com/the-tool/
Previously:
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
https://www.homemadetools.net/forum/...0705#post72983