Hi
I work for Honeywell Aerospace Yeovil in UK, and we are the UK Design Authority for the P and Q type oxygen masks.
The Q is the small facepiece, and the P is the large facepiece, all other features are the same.
What aircraft are you flying with this mask?
If you need other information on UK aircraft oxygen systems please ask.
e-mail me on
[email protected] if you want any other information on these masks.