The pb symbol came about because the first pipes were made of lead, and when they needed repair a new profession arose, and with it, a new phenomenon: plumber’s butt.
There’s a sizable chunk of mechanics I’ve interacted with that treat themselves to 100 low lead from the airport as a cleaning solvent and to use in small engines. Honestly the only thing keeping them from using it in their cars is the price.
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that same uncle later died of a preventable cancer. rip to a real rightwing bozo. 🫡
https://en.wikipedia.org/wiki/Rolling_coal