Choke Pull-Out Diaphragm for Weber DGAV and DGEV series carburetors.
These diaphragms now tend to suffer from age and the ravages of aggressive modern fuels which causes the "rubberized textile" material to harden and even crack, causing erratic running of the engine and fuel leaks.
Replacing the diaphragm is then the only sensible option.
Carefully compare the design of the shaft with your version as not all versions are produced anymore.
This particular version also serves as a replacement for 47407.056 which is no longer available.
Required quantity per carburettor: 1
This is item number 52 in the drawing.
Weber Part number: 47407.093