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That sounds more like 7/8 of an inch to me. The U.S. is pretty much metric they just refuse to admit it, try working on a U.S. built car with standard tools, military uses metric measure, scientists use metric, the roads and radio stations weather folks seem out of step.Little Steven said:. A half inch pipe is a 22.5 mm pipe but still a half inch dia. It just adds too our cultural feeling of inferiority.:))