How to choose the PU tube pneumatic pipe joints?

Material is generally compressed air pipe quick connector of plastic, iron, copper, stainless steel, etc.pneumatic pipe header interpolation methods are fast, quick twist, withholding, etc.optional step:1 high-pressure air circulation is much pressure, pneumatic pipe joints can afford.2 Pu tube diameter, select the interface size pneumatic pipe joints.3 is a flow of gas with or without resistance, according to the material selected from the pneumatic pipe joint.4for the purpose,is to use industrial, commercial use,or medical industries. According to this selection clear tubing fittings meets the standards of the field.