The Festo has The Festo push-in fitting and self-sealing QSK-G1/2-12 male thread with external hexagon.

Size Standard
Nominal size 6,4 mm
Approved tubing type (* PAN-, * PAN-MF-, * PAN-R-, * PAN-V0-, * PEN-, * PFAN-, * PLN-, * PTFEN-, * PUN-, * PUN-CM-, * PUN-DUO-, * PUN-H-, * PUN-H-DUO-, * PUN-S-, * PUN-S-DUO-, * PUN-V0-)
Tubing insertion depth 23,1 mm
Typ