Dimensions

Top inner hole (Diameter): 16mm
Top outer hole (Diameter): 20mm
Bottom inner hole (Diameter): 23.7mm
Bottom outer hole (Diameter): 30mm
Inner Screw:

Pitch: 1 mmNumber of Starts: 1# TurnsNum Turns: 4Lead in Pitches: 2

Total height: 15.7mm

Print suggestion

I'd suggest you to print with a 0.15 layer height on a 0.4 nozzle.
I printed it with Sunlu White PLA+ on an Ender 3V2.
Also I reprinted it with Sunlu Gray PETG on a BambuLab A1 (First pictures).

Also I flipped the model, used a brim and tree structure supports (see third image).
Your milage may vary.

About

I provided a modifiable STEP file as well as the printable stl file.
Onshape Link
It works on my Ocean Hookah Kaif S2 without any issues.

But I need to preface that this version is not optimal. I created this model in order to minimize the upshooting bubbles to prevent water in the hose (because I have a strong air draught).

I already have started a V2 which you can preview on onshape, but the total height exceeds the bowl currently.
In the future i will create a new thing here and edit this post after im done.

At last I need to also say: This might or should be a temporary solution, since afaik PLA shouldn't be used in water. PLA or PETG are generally food-safe, but need a coating to prevent bacteria from forming in the gaps. Look into PLA or PETG on the Prusa Knowledge Base website.