Crystal-Line Copper Tube Size (CTS) pipe is used for potable, reclaimed and sewer/wastewater transmission in the water infrastructure market. We manufacture Crystal-Line in CTS 3/4- to 2-inch diameters and IPS 3/4- to 6-inch diameters. Crystal-Line is made of PE4710 HDPE pressure material. It is typically solid or striped blue for potable water, solid lavender for reclaimed water and solid green for sewer water.