Please keep us posted with your progress. I suppose the system will only be as good as the fluid that it injects (in keeping the valves clean), and that will only be known in the longer term. I would prefer this route of prevention rather than cure.

I did contact the manufacturer and they would only tell me it was for LPG systems, and subsequently steered me to this - https://www.jlmshop.co.uk/direct-in-injection-valve-cleaner-500-ml-free-deli.html

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