... .Size :according to your demand 3.S16949 certificates. Air Gladhandpneumatic connector:Material:cast iron,aluminium ,copper Type:Germany ... and anti-contamination.5. Used to connect the air brake system of the heavy truck,semi-trailer,tractor ... in it,to reinforce the safety of the air brake system,it is easy to use and ... fix.7.Use to connect the air brake system of the heavy truck,semi-trailer, ...