Yes you would find a needle valve the same shape as yours. I agree with foxfish buy quality in the first place but as a cheap option if you already have a reg changing or adding another needle valve is a viable solution. if adding an extra valve place it straight after the existing needle valve and dont worry about pressurising bubble counterThat's sounds a good way to go ,
This is my reg , is it likely that I could find a needle velve which will fit in the same place ??
There would seem to be lots of budget models and very few quolity models....
This item number for eBay seems to be only place I can find them 170788363670 from Germany works out about £150
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