I just went through all of my T-850/950 parts manuals and cannot find anything that even resembles the above whatever.
Original parts manuals dated 1932, another 1934, and another from 1935 do not show that whatever. Even an ad from 1931 does not show the item.
Must have been something Tokheim added later.
Posting Serial numbers would narrow down the era this item started showing up on the 850s.
Author, Gas Pump Identfication books 1st & 2nd Editions & Air Meter Identification books
We rebuild ECO air meters and sell parts.