4mm to M5 Push in Pneumatic Air Quick Connect Tube Fitting Coupler 10pcs

Designed for Polyurethane or Nylon tubing. Even after installation the direction of the tube can be changed freely. Elliptical release ring help to connect tube easily by manual no special tools required. Outside (and Inside where applicable) hexagonal wrench tightening. This Quick fittings are only used for industrial automatic apparatus and can not be applied on any medicinal equipment.