AC line sizing

[subzerocarfanatic]

Does anyone know by chance what size the AC line is,the bigger one,their are 2 that run on top of the rail under the ECU housing side by side.I removed the housing and ECU while checking wiring harness and decided to clean up that area and insulate the what i assume to be the discharge line ( the bigger line of the 2), I have some rubber cork wrap tape for insulating AC lines.
I wrapped the receiver already but want to consider foam pipe insulation by the foot for the bigger line since space is to limited to get wrap around it I figured it would slide around the pipe easier but can not find a size reference anywhere.