Just go to any HD or Lowes and tell them you need 3/4" and 1-1/4" thin wall sprinkler pipe. It comes in 10' lengths and they have tons of it. The gray electrical pipe is schedule 40 and weighs way to much to use in a cue case. Neither Jay, Dennis or I have ever used the gray electrical pipe. Some Swift cases did use 1" for the shaft tubes which is too big IMO.
Thank you!