TS16949:2009, ISO9001:2000, DOT certificate Trailer air brake reinforced hose :• Material:PA,PU,double nylon tube• ... ,22,24,26,28,30 coils.etc.• Stretched length:5m,5.5m,6.5m,7.5m.8m,12m etc.• Explosion Pressure ... (Polyurethane) TubeTubing -- PU (Polyurethane) air brake coils, spiral hoseDouble tube--Trailer air brake reinforced hose, air brake coil with double layerDouble ...