If you have a dynavap, the hula stem is a great (and cheap) addition. Would even go as far as to call it an upgrade!
This is an all glass stem which mates perfectly with the modular dynavap tip (both stainless steel and Ti). There is no ‘carb’ hole on this stem, so the type of hit you get will be primarily down to the level of heat you apply and how hard/soft you draw.
I found this stem significantly enhances flavour and of the three stem types I have - steel, glass and wood - this is the coolest in terms of heat. You can’t touch wood stems for flavour IMO as the wood ‘colours’ the flavour but this is a close second and probably more accurate to your ‘erb.
This is great, cheap and good looking - I really wish the other colours we back in stock. Obviously, the glass will be more delicate, so take a bit of care to put away once your sesh is done, not roll it off a table etc.
It’s a tenner vey well spent - go for it!