Flashback prevention is a concern with fuel-oxygen burners. A flashback occurs when a combustible fuel-oxygen mixture is forced back through the burner into either the fuel or oxygen line.
My opinion is that trying to add a flashback arrestor and check valve would not improve the safety and would be relatively difficult (I mean, you wouldn't be able to do it with an off-the-shelf configuration), unless you used a welding type fuel regulator. Welding components, such as flashback arrestors use a 9/16"-18 threads per inch connector (a "B" fitting) while propane fittings are pipe threads. You certainly can use threaded adapters with hose nipples.
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