Samco Sport vacuum tubing is pure silicone rubber hose, which is available in internal diameters (I.D) from 3mm to 9mm. Specifically designed for all engine vacuum lines, carburettor vent hoses, fuel tank vent hoses, coolant overflow and emission control and can be used for washer tubing and wire insulation. Suitable for low pressure installations only. Samco's vacuum hose is not designed to carry oil, fuel or for continuous transfer of pressurised hot water. Featuring an incredible stretch characteristic in diameter, allowing the hose to stretch onto a connection for a perfect seal (i.e. you can stretch a 3mm I.D hose onto a 5mm O.D connection).