I use default Dynavap tips with all my UDs, but it takes a piece of silicone tubing on the end of a the stem to mate better with a "standard" UD. I can make this work with both the Alphas and the SC3s. But I have to remove the silicone tubing to refill.
Ed of Ed's TNT has commissioned a
slightly larger OD Dynavap-type tip ($45 - don't know if that ever goes on sale!!!) that should fit snugly into the Alpha core - I intend to give it a try but don't have one yet.
Otherwise the ACXL is the best way to use standard Dynavap tips - and stems, the tips don't fit in any of the UD stems that I know of, they need 8mm ID (inner diameter) to take the Dynavap style tips. UD's glass stems are 10mm ID.
OH WAIT!!!! Here is how you can use any Dynavap tip with (almost) any UD stem:
Dynavap bong adapter
I just tried it. It fits down into either the standard or the Alpha size UD stems. It should fit anything up to 18mm - and you can of course use it directly with your bubbler or bong. It is manufactured as a 14mm to 18mm wpa (water pipe adapter aka bong adapter). It fits inside the 10mm ID standard size UD glass stem OK and fits down into the Alpha stem about halfway. I don't think this will work with the UD stainless steel stems.
Stem Sizes:
Small stainless tipped stems: 5/16" 7.9mm OD, 17/64" ID 6.75mm id
Standard glass stems: 15mm OD, 2.5mm wall, 10mm ID
Standard glass stems (thin wall no longer in production): 13mm OD, 1.5mm wall, 10mm ID
Alpha stainless tipped stems: 7/16" OD, 29/64" ID 11.5mm
Alpha glass stems: 19mm OD, 2.5mm wall, 14mm ID
Don't have measurements for the nylon stems but it might be possible to drop a nylon stem into the bonger and be able to affix a Dynavap tip to almost any stem, at least for anything between 10mm and 18mm OD.
Looking at all this now I think you should be able to take a Dynavap B (I think that's around $35) and stick it in a bonger ($15) to attach to your 10mm stem or bong/bubbler. Use the
Fat Mouthpiece ($2) to adjust it for 14mm. This should work with any stem with an ID of 10mm to 14mm (with the Fat Mouthpiece).
So if you buy any tip and a bonger, you can fit it to any of your UD (and most other) stems. You don't need a complete Dynavap at all, and you can't use the caps with any UD - so you don't even need to buy the caps.
I'm glad you asked that question because it made me think and realize I can still use all my existing UD glass stems with my Dynavap tips and my ACXL or hopefully with Ed's Thermal Expansion tip in the Alpha.