One option may be to remove the male "B" fitting from regulator body and replace it with a 1/4 NPT (national pipe thread) coupler then use series of reducers and couplers to get proper connection from your hose to coupler on regulator body...these items should be available at any good hardware store that has well stocked plumbing dept.
Yes the threads in regulator body should be 1/4 inch National Pipe Thread. Just be careful removing existing fitting so you do not damage fitting or regulator body... (only hose connector side is left-hand thread).
Another option...
IF you can go to welding supply and get a short piece of hose (maybe a foot or so) with "B" fitting on one end, you can get barbed fitting that has standard threads (NPT) on threaded end and put it on other end of short hose and adapt NPT fitting to match your existing pipe fitting... The problem is the regulator connection, everything else is hardware store stuff...
The left-hand connection ( B fitting ) is unique to welding industry so most hardware stores will not have anything that fits to it unless they have welding hose repair kits.
Dale
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