This versatile adaptor creates an airtight seal with any vehicles EVAP system at the filler neck, eleminating the need for searching for the EVAP service port. Includes a capless adaptor for capless filler necks. Compatible with any smoke machine. Contains: (Qty.) (1) Universal Filler Neck Connector, (1) Capless Fuel Tank Adaptor, (12) Sealing Discs.