You better have a storage air tank,filters and a big enough motor to supply air for two. Some can be hard to breath without storage air tanks. Then if you do any underwater work on top of that. You also need a Low pressure regulator. I'm looking into getting one myself. Theirs one Hookah out their for a reasonable price. Think it's called {Hookah max} It has storage tanks ,cheep, easy to work on and complete and ready to go. Just be careful with fumes and crazy people that come up to dive flags. They don't know what they are. I also heard that the Honda motors are hard to start. They have new motors out that are real easy to start. Good luck