I just replaced a PVC line to a hose bib with copper pipe. I put a 3/4 brass union next to the shutoff valve. I got it all done today, but when I opened the shutoff, water was dripping out of the union. I tightened it as much as I could, but it won't stop dripping. A guy at the plumbing supply store suggested that I stuff plumbers putty in it, but that didn't help at all. I installed it nice and straight, and it goes together easily/ What should I do?
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Help!, My Union leaks