As above really - has anyone got one. I can't get hold of one locally and Its the only think I need and I don't fancy bending over for the postage everywhere charges. (Happy to paypal a couple of quid to a locostbuilder for one of course)

can you not use a copper plumbing fitting ?

after asll 1/2 inch inch tubing is a standard size, 5/16 (= 8mm) may be a microbore size?

I've used this to mate different sized water hose tubes