The Recycler Oil Pipe with Diffusor has a recycle function - the water is swirled through the inline slit diffusor with 4 slits, drawn through the tube into the second chamber and flows back into the main chamber. The water is oxygenated and harmful substances get stuck to the wall. The surface of the second chamber has a depression for the oil. This facilitates dabben in good company. Including oil nail and glass dome.