TS16949:2009, ISO9001:2000, DOT certificate Air brake coil with double layer nylon :• Material:PA,PU,double nylon tube• Hose size(OD*ID ... -- PA (Polyamide, Nylon) TubeTube-- PU (Polyurethane) TubeTubing -- PU (Polyurethane) air brake coils, spiral hoseDouble tube--Trailer air brake reinforced hose, air brake coil with double ...