For a little 39cc 2 stroke carby similar to those found on whipper snippers. Im fixing my mates little scooter and it has a crack in it, fuel is leaking everywhere. Not really a part that i have seen before at a bike shop.
Yeah, it physically sits "under" the carby you push it a couple times to "pump" fuel from the tank into the carby, yeah it does fill up after a couple pumps. Its made of a rubber that has gone brittle after having an empty tank for a couple years.