Faucet wrench.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...h_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...cet_wrench.jpg
Previously:
https://www.homemadetools.net/forum/...008#post153149
https://www.homemadetools.net/forum/...516#post173877
https://www.homemadetools.net/forum/...552#post123027
https://www.homemadetools.net/forum/...198#post134716
https://www.homemadetools.net/forum/...764#post133143