http://i.imgur.com/2GAYGxx.jpg Is what it looks like sitting in the bowl. Would that 4mm make that big of a difference? I'm ok with being told I maybe kinda fucked myself in buying this bong to use with my arizer.
The problem you have is the end of that downstem is a bowl (intended to be filled with herb), not a GonG fitting (intended to link to another piece of glass). The angle of the taper is wrong (GonG fittings have smaller angles like the piece on your Air) and it's not precision enough (it's not
ground glass like the other GonG fittings in your photo are. Even if you got a good match it wouldn't be round enough to seal 'glass on glass'.
However, if you wrap some rubber bands around the end of the GonG fitting on the Air, enough to build up the diameter enough to seal against the bowl you should be good to go. Not elegant, but something you can do tonight.
You might want to check out the 'cheap glass thread', lots of good stuff from DHGate in use by many Members around here. In the end WTs for smoking are OK with vapor, but ones designed for vapor tend to be better I think.
that is a downstem I haven't seen. The down stems have 2 sizes - where it fits in the pipe - yours is 14 - and the opening at the end where you insert the gong.
Nope, don't agree for the reasons above. Some downstems (like the on on my big bucks Ehle) end in bowls not fittings. I had to buy a new downstem for it to mate with vapes. I think WTs made for nails (concentrate) use are really what we want?
OF