The nozzle cap (12) has a first part (13) fixed to a motor, a relatively moveable second part (14) with larger diameter, and an extension mechanism. This has pivoted extension arms (15), hinged with a first end to a support structure (16a,17a) on the outsi...

The nozzle cap (12) has a first part (13) fixed to the motor, and a relatively moveable second part (14) with larger diameter. A closed volume (15) is charged with a gaseous fluid to move the second part from storage to operational position. The closed vol...