med-gas help!

anybody out there med-gas certified? im testing soon and am still not sure about one thing on the test. my paperwork is unclear on whether or not the void between the ends of the pipes must be filled. . . . i know you must have fusion between each pipe and the length of the coupling, but am uncertain on whether or not the pipe ends must be fully joined together with brazing material. . . .like for sanitary reasons so that there is no small niche for bugs to grow.

any help is much appreciated

 

i come and go just reading through TW, i used to work as a plumber and did some of this work.

there is a med-gas forum that is helpful @ http://medicalgasforum.com