Steyr Pro X fill port plug

Hi all,
Good fill port plug for Pro X?
Not sure if this one made for the Steyr LG will fit well-
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1679002490529.jpeg
 
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I simply used the fill probe, leaving it in place, but putting a cap on the quick connector coupling male end.
Just did same, tried cheap amazon fill probe
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and did not work for my Rifle, returned and added quality fill probe to a existing order from Joe B for 24 bucks (looks like the same one on Donny's site) and male foster caps, fill probe caps and female foster caps from Air Tanks Plus.
 
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