Umarex Umarex fill valves

I have two leaking airguns an umarex g30 gauntlet, and a javelin pro I purchased here awhile back.

both have bad fill valves, I tried to order some 1/8 npt an some ban threads. I finally looked with my tap and die at and best guess is they are M10 x 1.0 threads.
I see many on the market but non seeem to have the neopreen seal at the base like the factory ones.

anybody have some insight as to where I can find some replacements that have similar seals and proper thread to install in factory bottles? Thank you!

I considered a flex regulator for the gauntlet, but looks like I need to swap bottles too. More than I want to for a hog gun…. Any insight is most appreciated!

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Kind of funny. i came across this thread in a google search. Same as OP stated, i have a Gauntlet G30 and Javelin Pro both leacking through the fill valve. OP did you come up with a solution? And possibly a link where to purchase? i dont want to go through Umarex. Thanks in advance!
I tried BSP, NPT, M10, and M8, none were right. I replaced an o ring on the inside and stopped that leak, but the outer oring was brittle, and my replacement quickly failed. I just ordered a new 3100 regulator and fixed one…. I still have to hobble a fix for the the javelin, I’d like to try it for gator season!