Biggest needle for filling Z-Atty-Pro?

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I've searched ECF, House of Hybrids, Provape and Google without finding the answer. I also posted the same question elsewhere on ECF. But, maybe in the wrong sub.

I need to order some syringes and blunt needles specifically for my ZAP, but with other uses probable too.

So, does anyone know the largest needle (smallest gauge) which will fit the fill hole on a ZAP?

Thanks!