This is one of several 2100 fuel inlet types. This one has a 1/2″ inlet. Uses a brass fitting 90-10 with a gasket, then a 30-91 fuel filter. The fitting has an inverted flare. The fuel filter fits against this and does not use a gasket. This would be typical of 1958-1963 carburetors.
Updated on 12/17/2020