Boy, that does look similar. Mine is steel.I did find this but it's aluminium and for AC I believe. Now they "may" been made in steel years ago and work for Hydro. I don't know and YMMV but it may provide a clue.
BL08-08TM45T | 13/32" Hose x 1/2" O-Ring 45° (Aluminum)
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There was no o-ring on it when I took it apart.Is there an o ring in the female end? I've seen stuff like this in oil and AC applications just not in hydraulic, but there is always a first.