Cata GHI 6104 BK /A Instrucciones Para La Instalación, El Uso, El Mantenimiento página 59

2. Tighten connection place with the keys so that the pipes
will be in proper position,
3. Attach C coupling to the main gas source by using hard
copper pipe or flexible steel pipe.
WARNING; Final Check whether any leakage exists at the
pipes with a solution with a soap, and do not ever use flame.