IL twin-wall gas vent system comprises a comprehensive range of pipes and fittings. It is constructed with an aluminium inner lining, a Zalutite outer and is air gap insulated. Having an instant locking device it is secure and easy to install. It is suitable for gas appliances with flue gas temperature not exceeding 250°C and is available in diameters 100mm – 150mm (4in to 6in). Click here for IL Brochure >