I haven't but I'd like to. What would be the best way to do this? I'm not sure where one would leak from. I've already fixed two leaks in my setup and I've run through two 5lb CO2 tanks in 1.5 months because of them. I just want to be absolutely sure that I have no more. I'm not paying to fill this thing up every 2-3 weeks. My regulator gauges both retain all of their pressure overnight if I close the CO2 cylinder (whereas they didn't before), so I'm fairly confident that everything from the CGA320 connection down to the solenoid is leak free. Now it's just the connections exiting the solenoid and then to the check valve/bubble counter and then the atomizer. These are all O-ring or pressure connections and there's no teflon tape on these, but I'm wondering if everybody just soapy water tests all the way up to the atomizer?