|Some of the trademark features of a KM hookah include the wide-gauge tubing, high-functioning purge valve, and the bell-shape design on the tip of the down stem. I've heard the most praise regarding the extra wide hose port. By enlarging this part of the hookah, it allows for more smoke to be pulled at each inhale - allowing for some wicked hookah smoke clouds.
The strange thing about these hookahs is that the spelling may be different depending on where you get them from. Sometimes it's Khalil Mamoon, Khalil Maamoon or Khalil Mamoun. These aren't knock offs trying to trick you (usually), this is simply a symptom of Western society trying to commercialize an item that does not have a definitive translation from Arabic to English. When dealing in international markets, different distributors, importers, and vendors will often come up with slightly different latinate representations of Arabic words. Just as we refer to the juice in your shisha tobacco as molasses, the spellings can range from ma'assel, moassel to mo'assel. As the old American idiom goes- "If you're not sure...make it up!"