Correct.
I have the top round "head" which has separated from the main "stem" of the fill valve. The little o-ring which sits below the round "head" is gone and the "stem" is still in the original spot in the grenade. Hope that makes sense.
I can take pics if that helps...
edit - here is a picture of the Mabull replacement fill valves to better illustrate what I am talking about
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