Thanks Terence for your reply.
As to my question, no doubt you know I do not have any knowledge in your field, and I have no intention of doing any diy where gas is concerned. Too dangerous as can be seen by todays news of the gas explosion in Manchester yesterday.
My enquiry about the two sockets was to gain a better understanding of the fitments.
The socket I have on the gas supply pipe is a micropoint one as can be seen at this site :
http://www.tanksrus.c...uct=Micropoint-Socket
Another query I have is that the fitment on the gas cooker hose does not have any "lugs" so as to insert them into the two grooves where after pushing the hose fitment down and giving it a twist will secure the two with the aid of the pressure from the fitment attached to the gas supply pipe.
If there are no "lugs" to insert into the micropoint socket, how will it remain secure?