plastic tube fluid handling means provided in the form of one or more polymeric tubes embedded in foil laminate which includes metal and at least one polymer . the preferred polymers are polyolefins and polyamides . the metal provides barrier protection making the structure suitable for use in fuel lines , refrigerator hose , in - floor heating pipe , solar hot water heating systems and the like . the tubes are of a geometry which provides burst strength , so that the metal can be quite thin .