Building my first CO2 chamber, advice on parts?

[Stewart_Reptiles]

Thanks!
Out of curiosity, do you use a paintball canister for your CO2, and if so, how many uses do you get out of it with a container that size?

I used to but after having someone inexperienced overfilling it (which is scary when it happen, good thing it did not happen in the car) I decided to have people a little more professional doing it and now instead of filling up once a month it's down to once a year.

I have a 10 lbs container with regulator and the place just exchange the tank when I need them to.