BES sell two types of flexible liner - 1.) The Triplelock stainless steel flue liner is CE certified to BS EN 1856-2:2009. Suitable for atmospheric gas and kerosene appliances. 2.) TecnoFlex Plus double skin flexible flue liner made from corrosion-resistant 316 L stainless steel, has corrugated outer and smooth inner skins. Compatible with the screw fit terminal and adaptor ranges. Suitable for use with gas, oil, seasoned wood and smokeless solid fuel where the max. flue gas temperature does not exceed 600°C. CE certified to BS EN 1856-2. BES sell packs, terminals, clamps and accessories.