I had the same leak last year. I just tighten the allen screw tighter and it stopped leaking. I think it is just a pipe thread with no "O" ring or gasket. If that doesn't stop the leak you might try using teflon tape on the threads but be careful not to get any tape in the fluid.
Good luck.
Walt
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Walt and Judy
2019 Mobile Suites 36RS3 #396674
2022 GMC Sierra Denali 3500 DRW 4WD
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