Thermo Isolator / Spacer for Zenith INAT 35/40 carburetors.
Bakelite-like spacer that is used to prevent heat-transfer from the throttle body to the main body of the INAT carburetors.
Measures some 5 mm in thickness.
Required quantity per carburettor: 1
This is Number 45 in the drawing.
Please note that the Zenith INAT was also produced as Solex INAT.
The Solex INAT can be found HERE.