After sanitising the tap you can then drive it into your keystone (using a rubber mallet) the hard taper will create a seal against the cask that will not leak if inserted with force. Once the ale has settled you can draw of a sample to check clarity, the smooth opening and closing action won't disrupt the hops or yeast. The "Y" or "Yorkshire" thread allows you to attach a brewery nut that also has a Y thread and in turn attach a hose tail to suit your proffered size hose. Use with a hop strainer to prevent any hops entering your beer lines or your customers pint. The tap can easily be disassembled for cleaning. Smooth opening and closing action, strong design, no leaks. Preferred choice for breweries.