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That’s what I was thinking too Richard, but with those other things right next to it I’m afraid it won’t line up right when tight.  If I replaced it with exactly what is on there now, does this look right?

Push-to-Connect Tube Fitting for Air, 90 Degree Swivel Elbow, for 1/4" Tube OD x 1/4 BSPT Male

https://www.mcmaster.com/5779K426

Uses a 14mm wrench and my untrained eye thinks it is the tapered thread.