Solex 30PAAI-2 pump diaphragm    P/N 10241

As used only in:

Solex 30PAAI-2 Spec. S.1492 carburettor

Rover 75 16HP P3 6cyl. 1948-49

This spec carburettor has a unique accelerator pump assembly not fitted to any other 30PAAI Solex carburettors, exclusive to the Rover 75
This is called the combined two-phase acceleration and economy device  

The diaphragm membranes used in this device are different to all other 30PAAI Solex carburettors 

Items number 96 and 102 on this illustration