AHHH who sells them???

[madcampbell]

Can anyone give me details of a company where I can buy some replacement valves?
Mine are made of metal and have a 13/13.5 nut on the outside

I do not know who made the alloys as the are non standard (I think) so I cannot go back to them…

Any help would save lots of trips to keep topping them up

Thanks
Mark
Have added a pic you can just make it out..
has now been answered in genral forum for anyone who is interested