outlet adaptors of metal; control apparatus for the delivery of liquid fuel (metal, non-electric) including apparatus to indicate fuel type; delivery control apparatus for fuel storage tanks (metal, non-electric) including manually operated product indicator devices; control transfer devices in the transportation and storage of fuel, petroleum and chemical products; apparatus for controlling the correct discharge of fuel from road tankers (metal, non-electric) including product indicator panels; precision oil delivery control apparatus for use on road tankers