This CM Becker pin lock style disconnect is made in Germany and assembled in the USA. It is for the three pin liquid connection and features a short body and a 1/4" flare connection.
Most commonly, you will need a 1/4" swivel nut with 1/4" barb to connect the standard 5/16" red gas line.
For EvaBarrier tubing, a Duotight 8mm with 1/4 flare fitting is a common connector.