Re: auto seal system
In my opinion, they can be a little bit more trouble than what they are worth. It's great to put auto-seal hose adapters on my hookah at parties and stuff so I don't have to remind less experienced smokers to plug their hose. However, myself and my friends who smoke regularly find that auto-seal valves tend to restrict airflow slightly and make a pull slightly tougher. In addition, you HAVE to keep the ball bearing inside of these things clean (which is sometimes hard to accomplish without disassembling it) or else they will gunk up and you won't be able to smoke through them until you do. You can still clear your hookah as long as all the valves aren't auto-seal (have at least one "open" valve).