... require,OE No.4522002210,9522002210 4522002110 Cast iron / aluminium Trailer Air brake coupling head for full trailer, tractor (1).Material:cast iron,aluminium ... easy to use and fix.(3).Use to connect the air brake system of the heavy truck,semi-trailer,full trailer,tractor ... ,welcome to contact with me and visit our company ! trailer brake coupling pamp coupling,air brake system ,brake valve