A few questions to those of you that do CO2 chambers...

Greetings, I am working on setting up my own small mice breeding setup, and I am curious to know those of you that have done it, what are you using for the outlet for the CO2 into the chamber? I am thinking of going with a larger air soft CO2 tank, a flow regulator, and quick connect / disconnect air lines, which is all easy to figure out, but what I can't figure out is how people actually get the CO2 to flow through a nozzle, all the nozzles I find have handles you need to grip or trigger to allow flow, or have stopper valves so they don't flow unless something is inserted into it.