Subaru EVAP Evaporative Vent Valve Plug.
 
An alternative to this plug for early model Subaru cars is the EVAP Drain Valve Plug. 
 
Housing Only = Plug Only
Connector Kit = Plug, Terminals, and Seals
Pigtail = Plug with Wire to Wire Connection, Terminals, and Seals
Pigtail with Crimps = Our Pigtail Option with a Butt Connector Crimp per Wire for Easy Install