Updated: Sep 14
They are a bit different
Confused about Metric and Imperial Pipe Sizes? When the industry moved from imperial to metric sizing it was done in an uncoordinated fashion. Consequently sizes are different for plastic and steel products! Click for PVC and ABS Pipe Click for See Copper Tube Click for Stainless Pipe The following is a quick conversion chart showing sizes of stainless steel, mild steel, plastic and copper tube or pipe.