| M5 | M6 | 01 | 02 | 03 | 04 |
| M5x0.8 | M6x1 | R-1/8 " | R-1/4 " | R-3/8 " | R-1/2 " |
In mm, Ø D refers to the outer diameter of the tube.
R refers to the connecting thread.
G indicates that it is a cylindrical thread.
Example: PC 08-04 corresponds to a push-in fitting of the PC series with 8 mm. diameter and a 1/2 "thread.