Float chamber gasket. Should be replaced whenever you lift the float chamber lid.although these are a bit thicker than others I have had in the past so maybe it will last a few fits. Why would you be lifting the float chamber lid?.
This product would be ideal for restoring classic Triumph TR4A Spitfire TR7 MG MGB motorcycles or other engines that rely on a carburetor and have a carburetor carb float chamber gasket.