Hooks up to all my joints seamlessly and it has a solid tight fit, only con with this one is the fact it slightly reduces the airflow but it's not a huge issue if it's loosely packed. Works great with hydrotubes but overall I prefer the bubbler stems.
It would get five stars if it came in specific sizes so it would be less bulky, easier to pack.
Makes it extremely easy to use a water pipe with my Arizer ArGo. Easy to clean seems sturdy enough so far. All in all until further notice, 5 stars.
Purchased this with the Borosilicate Showerhead Bubbler 18mm. Overall works ok, though connection is not perfect with the adapter, there is some wobble and the connection is not perfect allowing air to enter the chamber. I solved this by putting a silicon band around the adapter. Finally while this is nit picky, the hole is not centered on the piece. Overall happy with the purchase after the band solution.
This and some glass for the win.