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Stop what you're doing right now and book yourself on a gas safety course. Your own or others deaths are not worth 'learning from experience' when it comes to highly volatile substances.
My father became a safety officer after a gas accident caused him to lose his sense of smell (and subsequently sense of taste), he was lucky. Do not risk it, it's not a "what the worse that can happen" sort of senario.
That link is coming up as "This channel doesn't exist" - have they changed names or shut it down?
I have finally got the gases (oxy-propane) for brazing but like @fizzy.bleach not 100% sure how to connect it all - esp. where the connections to the flashback arrestors go. Is this more or less accurate: