Bleeding brakes in 2003 Tahoe, what size tubing is needs for the nipple on the caliper side?

[Slammedchevy01]

Want to bleed my brakes on my 2003 Tahoe 2wd, as my fluid is green.

Does anyone know what size tubing I need to be able to securely put on the bleeder valve nipple front/back?

will be doing the motive pressure bleeder for the first time, any tips appreciated!
Thanks!

 

[Slammedchevy01]

Picked up some 3/16 tubing, found some YouTube videos using this size. We shall see. Lol