This new Cleantec connecting sleeve has a rotating bleed valve to adjust the air flow rate at the tool end of the hose. The bayonet design ensures a positive lock so the hose can't accidentally detach.
The fitting allows a D 27 millimetre dust extraction hose to fit over a D 27 millimetre dust port, or into a D 36 millimetre port. The adapter is built short and compact for optimal ergonomics.