XMAX OONT PRO Glass Adapter 14/18 mm

A 14 mm and an 18 mm joint, both male. That lets it fit bongs and bubblers with a 14 mm or 18 mm connection. A water filter or glass piece is not included.

Yes. Vaporizer Heaven and Vaporizer Shopping describe it as a two-in-one part: on the device alone it works as a regular mouthpiece.

No. Retailers point out that spare parts of the old OONT and the OONT PRO are not interchangeable. The old OONT has its own glass adapter with the same joint sizes; it has its own entry in the price comparison.

Vaporizer Heaven recommends adding only a little water, since a small amount is enough for cooling and less water gets pulled along. Seat the adapter in the joint with light pressure and a short twist, and clean it regularly with high-proof alcohol so the draw stays free.