This is an injector for a rocket motor attributed to the American rocket pioneer Robert H. Goddard and static tested at Fort Devens, Mass., on 3 Dec. 1929. He called it a "plug-type" injector. The injector head was one of Goddard's early efforts to find both a suitable means of propellant injection and cooling of the rocket motor. This object was found in the NASM collection and accessioned in 1966.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.