I just bought a couple of evods from ebay. They haven't arrived yet. I don't know if they are a single coil or dual . I do know they are glass tanks. (pyrex). But from what I've read on the forum there is a good chance they might be dual coil tanks. It didn't mention dual coils in the description so I just assumed they were single coils. My question is can I use single coils in these tanks as well as dual coils? I just bought a bunch of singles and I don't want to order dual coils if I don't have to.