Mine is manufactured by Radnor, and is labeled for regulator to hose. You can also buy them for 'hose-to-hose' or 'torch-to-hose'. The actual description on the package is
B-size, 9/16"-18 UNF THREAD WITH REVERSE-FLOW CHECK VALVES
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ESC
Soft glass on a Minor/concentrator since 1996
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