Re: can't connect ozone generator to oxygen tank, help!

sigh, this is so frustrating..
i got the regulator only to find out when i turn the oxygen knob (with the regulator on and set to 1/8, or without the regulator attached), no oxygen comes out, nothing happens at all. I can only turn it maybe half a full spin before it stops, and my hardest effort pivots the whole tank even while i brace it between my knees without opening any more - im scared to do it again because it shouldn't take that much effort, should it?

An 1/8th of a liter per minute is very tiny and difficult to feel.  Try putting the output hose in a glass of water to see if any oxygen bubbles out.

its heavy as hell so either they sold me a defective unit or an empty one that's just heavy as hell. or I don't know what I'm doing. maybe I have to turn the knob behind the outlet for oxygen that has 4 holes on it like a 4 way intersection. no idea.

The tank itself will also have an on-off valve.  The pressure in these tanks can be up to around 3,000psi, so the regulator's job is to break that pressure down to a tiny fraction of the tank pressure. Therefore, once the regulator is attached properly you turn on the main valve from the tank.  When you do this the pressure gauge on the regulator will register the pressure of the tank.  This is a good way to tell if it is on.  Then turn the regulator valve on.  When you are done using it is always a good idea to turn the tank valve off and open the regulator temporarily to release the pressure built up in the regulator.  Then turn the regulator back off.