The silicone stems for the UD will fit the WW, but it's pretty snug. The outside diameter of the WW core is just a little bit bigger than the UD. I think they're both 3/8" iirc, but the wall thickness of the WW core is thicker, so maybe that's the difference. I can't speak to the glass stems, but my gut tells me that they won't work well (glass doesn't stretch much )Will any of the UD or HI glass or accessories mate up with the wych without modification or custom work to anyone's knowledge?
Im feeling like some glass accessories and a VVPS is calling for me... its either that or new vape time... i cant tell which yet.
Here's a picture of my WW along side my UD for reference: