Shisha Glass Globe Shisha Vase 18cm14mm Drop Cone Compatible This waterpipe is compatible with any 14mm drop cone. Percolator The percolator gives you smoother and less harsh hit. Round Base Shape This Waterpipe has a classic round base shape that help submerge the shisha stem. When the smoke is pulled through the shisha stem, it diffuses in the bubble base before being pulled up the top of the tube. This process results in a smoother and cooler hit that is still full of flavour.