I think it is just the check valves. I also just figured out what the two gauges are for, so that's all good lol.
Do I need special check valves or can I just go to a petstore and get any old check valves? Only other thing I need to know is how to clean out my co2 tubing (I'll use new lines if I can find them but for some reason I doubt I will).
I get the feeling as well that my atomizer needs to be cleaned now since I think it got clogged with mineral oil *sigh*
Only other thing of note is that I believe I have a small leak, but that leak being near the diffuser as opposed to near the regulator, since I can only hear a small little hiss of air near the bubble counter (I have an inline glass one that sticks outside of the tank).