The introduction of this Campingaz® patented invention, the "Easy Clic®" valve system, has revolutionized the connection of appliances to cartridges.
The system allows you to simply click your Campingaz® appliance onto the valve cartridge and align it with the control knob - now you're ready to enjoy the great outdoors!
This easy-to-handle system is both reliable and safe, providing a clear indication of whether the connection is open or closed and reducing the possibility of damaging
the appliance or over-tightening the valve.
Source from http://www.campingaz.com/