CO2 Dispenser

Hi All,

Looking for suggestions on a device that I can use to dispense CO2 into carboys on top of beer. With additions of dry hops I’d like a little more confidence that I’m not exposing too much or any oxygen. I have an extra CO2 tank with regulator and gas lines so I’m thinking of some sort of “wand” that I can use to spray the CO2 into the carboy. Any suggestions are appreciated!

I suggest dry hopping in a keg, post fermentation, at 35f for 2 days.