So my HFC almost killed me when i tried it out. i lite the tube that exited the cell and BOOOOOM i almost blew up. Thank god that it had a rubber lid and that was the first to go. I will post some pics soon. I will never ever use GLASS cells thats just crazy. check out this video, this guy has some cool cells. http://www.youtube.com/watch?v=ykGZ2tRY4kY&eurl=http://easywatercar.com/2books.htm?hop=lockergn