Looks like 3/8 female flare on the trailer end and 3/8" mnpt on the regulator end.
I would spray with PB Blaster or similar then try.
A LP gas dealer like Amerigas, Suburban , Ferrellgas etc could order this for you or you might find at a good camping store or on line. One option would be to get a hose with 3/8" female on both ends then use a flare to pipe adaptor into the regulator. I sell these parts but my company does not sell retail.
Good Luck
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Jim & Debbie England
Do you have Gas? 2015 F350 6.2L CCLB DRW 4.30 axle.
2020 Keystone Cougar 364BHL ,Gone 2012 Yellowstone Ridgeline 34RLT Fifth Wheel
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