BLACKHORSE-RACING Red 1/4" / 6mm Silicone Vacuum Hose Tube High Performance Pipe 10 Feet 3M Inside Diameter: 1/4" (6mm). Outside Diameter: 12mm. Wall Thickness:0.12" or 3mm Length: 10 Feet or 3M Please note that silicone hose is not suitable for fuel or oil transfer. Silicone hose is compatible with water or anti-freeze such as coolant.