... , ISO9001:2000, DOT certificate Trailer air brake reinforced hose :• Material:PA,PU,double nylon tube• Hose size(OD*ID):12×9,12×8, 8 ... -- PA (Polyamide, Nylon) TubeTube-- PU (Polyurethane) TubeTubing -- PU (Polyurethane) air brake coils, spiral hoseDouble tube--Trailer air brake reinforced hose, air brake coil with ...