Pipes, tubes, ducts and hoses, plastic, by use, Plastic products, Chemicals, Pharmaceuticals & Plastics, Pipes and tubes, plastic, for gas, Hose, metal, flexible, rust resistant, for gases, Metal pipework, valves and containers, Construction, Cocks, metal, for gas cooking ranges and space heaters, Ducting, flexible, metal, Valves, cocks, taps and fittings, metal, by use