Pneumatic fittings include below
Plastic push in fittings 3mm-16mm, M5 ~ 3/4″
Brass push in fittings 3mm-16mm, M5 ~ 1/2″
Stainless steel push in fitting 3mm-16mm, M5 ~ 1/2″
Pneumatic rapid screw fittings 4mm-12mm, M5 ~ 1/2″
Brass compression fittings 4mm-12mm, M5 ~ 1/2″
Push button safety coupling 5.5mm, 7.4mm
Muffler/Vent M5~1″