Identify what this part is

[Ant65]

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Hi there.
I wonder if anyone can shed any light on what/where this part has come from.  (see attachment)
I believe it is off a DC40 which I am putting back together but cannot see where this part actually goes.

The writing on this includes the following:
"12-7321"  "PP"  "2C" & "Dyson"

Many thanks