If one percolator in your bong isn't enough then the Double UFO percs of this bong will solve everything with their supreme cooling and filtering abilities. The air flow is great thanks to the 18.8mm female ground glass joint allowing plenty of pull will no restriction and the dual showerhead percs force the smoke to break up into incredibly small bubbles which provides the massive levels of surface area that are needed for fast cooling and cleaning. The bent neck makes it even more comfy to use when just sitting around at home on the couch. Blaze Glass also include a matching 18.8mm male fitting bowl to get you going immediately.