the drimaster has infact two numptys,
1 is at the begginning of the drimaster hose which allows how much flow you want, and the 2nd is actually on the tool itself, this allows a more controled flow, it also has a sleeve over the suction hose which can be moved to adjust the airflow.
overall an excellent tool, easy to use ,and saves time....... no drying strokes required,
well worth bidding for, imo
geoff