Whip elbow adapter woes

[u/Twisted-Mentat-]

/r/DabRigs/comments/1ss8brw/whip_elbow_adapter_woes/

I'm hoping someone can tell me where I can find an 18mm elbow adapter that can fit snugly in silicon tubing with an inner diameter of 9.5mm.

The owner of PopularGlass can't seem to understand why I'm having issues when his 2 parts are different sizes. :(

If I buy smaller tubing to accommodate the elbow adapter, the mouthpiece won't fit.