... No.4522002210,9522002210 4522002110 Cast iron / aluminium Trailer Air brake coupling head for full trailer, tractor (1).Material:cast iron,aluminium(2 ... connect the air brake system of the heavy truck,semi-trailer,full trailer,tractor etc.(4).Available type:Germany design,auto type ... ,welcome to contact with me and visit our company ! trailer brake coupling pamp coupling,air brake system ,brake valve