Thanks for the help all it is a thermal arc 181i and as mentioned above it is a Jamec I searched for ages looking at pics but never found the jamec range
Had a look for a Jamec coupler but they seem very elusive or expensive in the UK I wanted to switch bottle between my Kemppi 3200 and this has I think a Rectus 21 fitting so i measured the Jamec fitting and it was slightly larger so I had a go at turning it down into one the same as the kemppi if it failed i was going to buy a Rectus 21 tail drill the Jamec fitting and solder it in but it turned ok and is gas tight so now I can switch bottle easily between the two welders.
Thanks for the help all it is a thermal arc 181i and as mentioned above it is a Jamec I searched for ages looking at pics but never found the jamec range
Been on for a while now and with the bottle off its still holding pressure so pleased with the outcome it was loosing pressure when it was connected with with a clip but Im sure i could have sorted it but wanted to switch between bottles nice to have it gas tight as i dont weld much and if i ever forget to turn the bottle of I wont loose that precious gas.