What is an EGR Valve and how do they work (alfa romeo)

This Video is out of the norm for me. let me know what you think in the comments. A video on EGR valves and how they work. Filmed without a script if it goes well ill do more videos like this next one would be turbo chargers. To contact me go to. italiaautoparts.co.uk or   / www.italiaautoparts.co.uk   I am also on the look out for Alfa Romeo car products to review. I if you have something i might be interested in (cleaning products, new parts, car modifications etc. Also sponsership is also somthing im looking to start please contact me on the above links. Also if you have any projects or broken Alfa for sale and your within 100 miles of walsall west midlands please get in touch as im always looking for new projects to make videos on. thanks Neil at italia autos.