... 4.Corrosion resistance and no abnormal chemical YONGFA SILICONE VACUUM TUBE has good chemically and physically stable, they are Stable ... in apperance,Aging resistant and Corrosion resistant. These silicone vacuum tubes can be applied in the oil,are, ... the hose in black,yellow,green,pink,purple,blue,red, orange,invisible green and any color you want. ... can be printed on the hose. silicone vacuum tube