I’m sure it is but I will not vape off of anything brass. I am so sensitive to it. I ripped a brass 510 and squonk nipple out of my sunbox e7 and replaced it with ss. My coils stopped rusting and tasting metallic after switching to ss.I believe brass is used for conductivity reasons...but I could be wrong!
Wouldn’t be the first time!
The brass being in contact with my e liquid was even turning my cotton bright red; i confirmed this when testing my same diy liquid and rayon wicking on the same atty but on a different mod and it did not happen again. Anything brass is a no no for me and many others who are sensitive to it. I wouldn’t trust anything brass personally but everyone is different and has their own opinion.