I ordered a 18mm GonG vape attachment for my bong but it has still not arrived after almost 2 weeks. They said its on backorder and should be in any day so lets hope. Its gotvape on Ebay so if anyone else is thinking of getting one be careful cause they say that they have them in stock but nope.
I have a ROOR/Vapor Bros combo that i use exclusively. You don't need the GonG piece just stick the tube in the downtube.The GonG is nice and I have one but is not necessary.
check out my bong vape combo: http://forum.grasscity.com/toking-t...er-less-than-35-better-than-volcano-imho.html