I contemplated buying davides when I was using protanks for the more juice capacity. I ended up buying Sigelei puritanks inwhich basically were renamed davide attys. The protank base did fit on the puritank but had a small gap on the bottom and worked just dandy but I'm not sure about the dual coil configuration attys. I used protank heads in my puritanks using both bases until my puritanks all got broken and by that time I was enjoying my kayfuns, slowly shelving the protanks.