... /pipeDescriptionWe take the most advance technology in copper process, Rolling-Casting. Inner-grooved Copper Tube is of high cleanliness and super ... resistance, less crack, all eddy-current tested, 100% no pin holeStandardAISI, ASTM, BS, DIN, JIS, ENMaterialRed copper, brass copper, and so onOutside ... -022-26346801FAX.+86-022-26346802Websitewww.tjzdgl.com.cn Refrigeration copper tube-high quality