Application One-touch tube fitting is designed for use with air pressure tubing. It can also be used for other applications depending on the user's conditions. Features Quick installation, simple and flexible, space-saving. The tube fitting is available in a wide variety of models to meet all pneumatic piping needs. The tubing direction can be changed freely even after installation. All taper pipe threads are pre-coated with Teflon; G threads include an O-ring. All fittings have internal hexagonal holes, allowing easy installation in narrow spaces. Nickel-plated metal ensures anti-contamination and extends working life. Available in both metric and imperial sizes.