This product can be fitted to a central heating system provided it has been treated with a corrosion inhibitor. If you are unsure if your system had been treated please consult with your plumber. No moisture left inside before packaging, to eliminate internal corrosion Meticulously hand crafted to guarantee the finest top quality Highly advanced but proven technology chroming plant Automated processes to ensure a consistent high quality surface finish Nickel & chrome plated for durability & outstanding looks Total plating thickness is Approx. 50μ Products are completely sealed during plating to eliminate chemicals infiltrating the rail Tubes Steel profiles & tubes meet UK & international standards Horizontal tubes are 22mm diameter for enhanced performance Horizontal tubes are 1.2mm wall thickness for optimum strength & life cycle Threads are 11mm deep to aid sealing during installation Individually air tested to 16 bar to guarantee no leaks D Profile D profiles are 1.5mm