I've been searching and looking at pictures of Fluidmaster bottom-entry valves, like http://www.screwfix.com/prods/84007/Plumbing/Toilet-Fittings/Fluidmaster-Bottom-Entry-Fill-Valve-UK but I'm still not sure - where does the water come out? Is it out of the bottom? People say that they are very quiet but I'm just trying to work out how so. Thanks.