New to Kegging. But a dual tap. Hooked everything up but only had one keg of beer. Tapped it and soon realized the other line ( hooked up to nothing) was releasing CO2. I was able to make it stop. But cant remember really how. This morning came down and realized my 5lb tank was empty. Dumb me didn't check all the lines, but then it got me thinking about that secondary line.....So the real question is, if you have dual tap. Do you need two kegs. Or the way i shut if off actually was OK, but maybe leaking elsewhere.