Huma Air .25 dual transfer port internal o-ring size

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After about 1K shots through it, I can see some wear on the internal oring that seals between the transfer port and the pellet probe.

I would like to have some spares but I don't know the size of that oring 

Does anyone have info on which size that oring is and which duro hardness?

Rifle is Wildcat MK3 



Thanks!

 

[dc8cappie]

Try item D-1 by caliber.

https://fxairguns.com/wp-content/uploads/2020/05/20332-Renoveringskit-Impact-Power-Plenum-MkII.pdf

 

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Thanks!

That should be it.