End fitting for disposable spacer

An end fitting for a spacer assembly for fitting to a drug delivery inhaler device, said spacer assembly having a spacer body with opposing first and second axial ends, the end fitting comprising:

• an end panel having opposing first and second end faces;
• a first annular recess on the first end face for receiving the first axial end of the spacer body in a first configuration;
• second annular recess on the second end face for receiving the second axial end of the spacer body in a second configuration;
• an open-ended tubular projection extending from the second end face, the tubular projection forming a mouthpiece in the first configuration;
• and
• an aperture extending through the end panel from the first end face to the tubular projection to provide fluid communication from within the spacer body to the mouthpiece in the first configuration and for receiving the mouthpiece of a drug delivery inhaler device and allowing fluid communication through the tubular projection into the spacer body in the second configuration.