TS16949:2009, ISO9001:2000, DOT certificate Air brake coil with double layer nylon :• Material:PA,PU,double nylon tube• Hose size(OD*ID):12× ... etc.• Explosion Pressure :4Mpa(=40Bar) to 10Mpa(=100Bar)• Fitting:With two M16,M18 ,M22 ,1/2"fittings etc. or ... tube--Trailer air brake reinforced hose, air brake coil with double layerDouble tubing--Double layer nylon tube,double braided tube,reinforced tube