With the prime tank, you cannot use the stock prime top cap, but I think you can use the kayfun mini v3's stock top cap, otherwise you must use the prime nut (which allows the use of any drip tip) or any of the k series, special drip tips. All like you said, still top fill.Don’t own one of these tanks specifically, but I own several Steam Tuners tanks for other Kayfun models.
You can still top fill with these tanks.
The tanks allow for the stock “top nut” to be used.
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Steam Tuners also makes a line of single piece drip tips that replace the stock “top nut”. They have different versions, with different materials.
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Both of those configurations still allow for top fill.
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