Before revision: Sizes Copper Tubing Sizes (CTS) for Plumbing Nominal size Outside diameter (OD)[in (mm)] Inside diameter (ID)[in (mm)]Type KType LType M 1 1 1 2 2 3 United States, Canada, and Brazil Common wall-thicknesses of copper tubing in the U.S., Canada and India are "Type K", "Type L", "Type M", and "Type DWV": "Copper Tube Fittings", Canadian Copper Brass Development Corp., Publication No.
After revision: Sizes Copper Tubing Sizes (CTS) for Plumbing Nominal size Outside diameter (OD)[in (mm)] Inside diameter (ID)[in (mm)]Type KType LType M 1 1 1 2 2 3 United States, Canada, and Brazil Common wall-thicknesses of copper tubing in the U.S., Canada and India are "Type K", "Type L", "Type M", and "Type DWV":  Brass Development Corp., Publication No.