Tube flaring pliers.
https://diqn32j8nouaz.cloudfront.net...ing_pliers.jpg
Previously:
https://www.homemadetools.net/forum/...874#post137315
https://www.homemadetools.net/forum/...886#post137367
https://www.homemadetools.net/forum/...759#post108366
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Scout Crafter on YT had a story on these. They are for flaring the old lead pipes.