[cwl1979]

Looks to me like it had dual connectors for single fill and thay have broken off. The scarring on the rim tells me there was a braided line in there at one time. Grab some wrenches and remove the extra parts and you'll see a normal valve stem with core underneath it. When the combination hose breaks it releases a spring inside the tube so it doesn't cause both tires to lose all air. The original valve core in the lower stem holds the pressure.