Router table set-ups and some sawbenches can sometimes present extraction problems, with extraction often required from both above and below the table. This adaptor enables you to achieve this by having a 100mm flanged outlet with a 62mm inlet at the top. A cabinet or enclosure will be required to extract from with a hole made to accept the adaptor. When extraction is connected using a standard 100mm hose, a separate 63mm hose can then be attached to the top of the adaptor and connected to either a dust port on the router table fence or the crown guard of the saw bench. We are sure there must be many other dust extraction situations where this fitting would prove invaluable.