Ok so I'm new on here so here goes. I have a provari that I love. And I love tanks but hated getting the ones that slip all over and you pull it out of your pocket and juice goe all over. So I fell in love with vivi tanks because of the screw on caps. Down side I think cartos just work better. So as I was looking around I found a modder who takes a vivi tank and turns it Into a carto tank. It's great no leaking because they screw on. I don't want to put his info out just yet bc I don't know if ecf will allow me but if I can I will tell you where to get them. Thanks everyone