I've had my A5 for several years now, and I've always wanted to try using it with the tank in the vertical position. Not knowing any better, I've been trying to simply remove the hose and attach the CO2 tank directly to the vertical port. This results in a constant leak. When I put the hose back on and attach the tank in the traditional position, it works properly again. Can someone explain in simple terms why this is happening, and what kind of adapter I need to use make it work properly in vertical position? Thanks!