Thanks Tom - needle valves are quite widely available, it's the manifold I can't get hold of here.
I've called/emailed a lot of aqua stores and gas equipment suppliers - none of them has heard of a manifold to split CO2 from a single CO2 bottle nor have they any suggestions apart from a 2nd CO2 tank and reg...
No doubt we'll catch-up in a few years time
Just a thought.... could I thake the output from my existing needle valve (CO2 tubing), use a CO2 proof (dare I mention the word) plastic T peice and put the needle valves you suggested in-line to each reactor?
I'm waitinig to hear back from PayPal if there's some way I can put funds in my PP a/c that doesn't require electronic transfer - Citiabnk do not allow it to PP !
Then I can order from Rex
All the best
Pete