This very useful piece of glass is equipped with (2) Male GOG (Glass on Glass) Joints. It offers two key functions: First, it can transform any Syrian / Lebanese (male) fitting hookah into a standard, Egyptian style fit. With this you can fit any Crown / Tangiers / Egyptian etc. bowl on your hookah. Second, this will fit into modern style glass hookahs, and allow you to use any standard Egyptian bowl on glass on glass hookahs.