The regulator one is geared towards gas cylinders available in the UK, you would need to make it to fit whatever canisters you use. The other valve is a demand valve, just like for scuba diving, it allows gas through only when the engine requires it, when the engine stops, it turns the gas flow off.
I have just imported about a dozen of the diaphragms and valves from the US for some jobs I have to finish off, but they are readily available on eblag for less than 10 bucks the pair, if you search about.
I took a gas furance valve apart this morning and there was abig enough gasket in it that i beleive will work for my diaphrams. a lot testing I will have to do. Dale
Hi John the material I have is neopreme . there is two differant thickness . One is really thin the other about 3 time as thick .Thanks for the comment .Dale