I own a volcano classic and a vapor dome. The vapor dome sucks. I have all the pieces to make it the full glass-on-glass connections using the tubing and it is still terrible even with the giant holes corked too. One day i was hittin my bag and then i just took the valve piece (no mouthpiece) and pushed it onto the female part of my Medicali bong.
I created an account here, im always on Shroomery idk if anyone here knows that site, just to show you guys this shit. its really incredible, the bongs downstem is diffused and the perc part is a 4-finger tree perc so the irritating feeling of volcano is totally gone. the weird part is that there is a white gunk built up instead of black tar compared to smoking. it looks like snot kinda
its totally airtight too, its like destiny for me to own both things