spring coil / spiral hose / air brake hose (made of PA11,PA12) 1)Material : PA122)Applications : Use for the Air system connections in tractors,trucks,trailers,semi-trailers.3)Working Pressure : 7--8 Mpa and the operating temperature is -40--120°4)Dimension of the hose : 12*9mm(OD*ID)5)Length and working length : 7.5 meters / 4.5 meters (22 coils)6)Color : black, white, red, blue, yellow, green, ...