IMI Yorkshire Copper Tube Ltd., a U.K.-based copper tube manufacturer, has announced plans to market copper tube to the North American Plumbing and Heating Industry. YCT's tube meets all prerequisites of ASTM Standard B88, and NSF has certified it as meeting the requirements of ANSI/NSF Standard 61 for drinking water supplies. Initially, the tube will be available in 3/8-inch through 2-inch nominal diameters and in K, L & M designated wall thickness.