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He also has used a corded sawzall to cut open old water tanks and plumbing where the water flows out all over the tool.

He says that whenever these tools are powered from a GFI protected receptacle the GFI trips. (Gee, what a surprise!)

Just hope that the grounding pin on the plugs he uses are really grounded. Else the fault
current that is going to the ground would then go thru himself....