Water cooling tube question

[keno51]

what size PETG tube is needed to fit alpha cool g1/4" inch fittings

 

[lumineZ]

G1/4 only stands for the threads

You have to look at the specs on the fitting or take out a messure tool and see for yourself.

Normal sizes are:
12/10mm (12mm OD and 10mm ID)
13/10mm (13mm OD and 10mm ID)
16/12mm (16mm OD and 12mm ID)

OD = Outer Diameter.
ID = Inner Diameter.