Push fit joints CAN NOT be used for gas pipes
They are made of plastic, rubber and a metal reinforcing washer. If there is a fire, the pipes and joints are the first to give away. While the plastic pipes and joints are OK for the pressure, however, it it too risky to have gas piped through them. You can use them for compressed air and non hazardous situations, as long its not a hazardous or poisonous gas.
Speedfit / polypipes pipes can be dangerous if misused.
