A flow restrictor includes a body which permits the flow restrictor to be self-retained within a bleed port. Bleed ports are located over various portions of a gas turbine engine and extend through an engine casing. The flow restrictor body includes a bore extends between a flow restrictor body first and second ends. A slot extends between the first and second ends of the flow restrictor body. The slot further extends from an outer surface of the flow restrictor body to the bore. During assembly, the slot permits the flow restrictor to expand and conforms against the bleed port.