This is really strange.... So I have 4 EVOD tanks and all four of them can take protank coils. In fact, on the kangertech box, they are called Protank/EVOD/Unitank coils. I recently converted a friend to vaping and took her to a B&M to buy her a first mod. We got her an ego and an EVOD tank. I give her a pack of coils to start and a week later I get a message that they don't work. I think user error and go over to help her and sure enough, the stem on the coils is too big... rather the stem of the tank is too small to fit the EVOD coils. I double checked all four of mine and the fit fine, but her tank it does not. We went back to the B&M and they say that they have never heard of a PT/EVOD/UT coil and always sell separate coils for them. I'm confused... can someone clear this up for me? Should an EVOD tank for the PT/EVOD/UT coils from Kangertech (like my 4 do) or should they have their own proprietary coil (like hers)?