Nautilus Ice Waterpipe with Percolator 31.5cm18mm Female connector Size This Waterpipe features a 18mm female connector size. It is compatible with all 18mm male connector shisha stem. Nautilus Double Round Base Shape The double round base shape makes this Waterpipe easier to handle. The shape also helps submerge the shisha stem in water. When the smoke is pulled through the shisha stem, it diffuses in the base before being pulled up to the top of the tube. Its modern style design also perfectly