BLACKHORSE-RACING Silicone Vacuum Hose Tube High Performance Pipe 5 Feet, OD (12mm), ID 1/4" (6mm), Red Inside Diameter: 1/4" (6mm). Outside Diameter: 12mm. Wall Thickness:0.12" or 3mm Length: 5 Feet 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.