This Weber gasket washer is used between the fuel inlet fitting and the banjo bolt head on DCOE and IDA (dual throat) series carburetors. It is also used to seal the fuel filter plug on the DCOE and IDA series. Sold individually, one required per fitting.
This washer has a 16mm inside diameter, larger than the similar Weber Fuel Inlet Inner Banjo Gasket Washer (Part No. WC-41530.031, sold separately) which goes between the inlet fitting and the carb body. The large 16mm ID on this washer fits around the step on the Weber banjo bolt. Both washers have the same 20mm outside diameter.