Just a little clarity here.... Two things, there is no such thing as a "duel fuel" torch... Don't know where phrase came from but its a bad description for a fuel/oxidizer torch...
And by nature for the most part, a flashback arrestor is a check valve by nature unless it is a "fire (flame) stop" used in very low pressure (1/3 psi) natural gas or propane supply in lieu of a flashback arrestor...
The exception to the above is when you have two or more concentrators and you use a check valve to isolate each one from back pressure from the other ...
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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