Oxygen Masks
Hi H Peacock
Ref problems with your oxygen mask silicone facepiece. About 4 years back the RAF introduced a generic cheaper silicone facepiece for "P and Q" oxygen masks. It is a darker green colour and tends to be not as soft and less flexible than the original. This is most evident when stretching the facepiece to enable the valves to be located and seated correctly.
Your friendly squadron squipper should know the difference and might even have some of the original facepieces stached away and be able to help you out.
PS For those that don't know.
Squipper:- Survival Equipment Fitter RAF tradesman responsible for maintenance and repair of Parachute assemblies-Liferafts -Aircrew Equipment Assemblies (Flying clothing/Lifesupport )