This is just the base of the ProTank (I, II and III) that contains the part the coil head screws into.
Use this as a spare or if an oring fails
This will fit:
This will NOT fit the Mini Protanks.
All Protanks take the same base, they may look slightly different depending on when they were made, shine, cut, depth, but they all take the same base.
If you have issues with any Protank base, this will replace it.
Due to overwhelming demand only 5 bases at a time may be ordered in this run.