Pierceable cartridges can’t be disconnected once they’ve been plugged into an appliance, so they’re suitable for more intensive or longer use – they’re also our most economical and widely available cartridges. 
 
However, the C206 GLS cartridge has a new integrated flow reducing system, the Gas Lock System, which is compliant to the new European standard EN 417:2012 legislation. The system prevents the majority of residual gas from escaping the cartridge when accidentally disconnecting it from the appliance, thereby also preventing flare-ups.