I am putting my kegerator together. I bought a beer tower. It has the tubes with fittings on the end. Shouldn't these fittings be ball locks for my kegs instead of a screw on type fitting? I'm not real sure what the story is here. I got it from Northern Brewer and I told them I was using the (little black push levers ... sorry I don't remember the technical name) dispensers and they sold me two smaller fittings. But I don't need screw on fittings do I? I needs the ball lock fittings that snap onto my keg right? Help! Clueless in Seattle (actually North Carolina but the pun works better with Seattle).