WEN 3500 Generator Air Cleaner and Carburetor Removal - Manual (Page 6)

There is a Gasket BETWEEN the Carburetor and the Connecting Block.
Remove it and set it aside for reassembly later on.
Behind the Carburetor Gasket is a Connecting Block made of a black plastic material, followed
by an Inlet Gasket that seats against the engine itself.
The reinstallation order is as shown above.