new colored fill plug, better seal, rework of the innards that you dont see under the coil area which contains the wires and bluefoam(prevents leaking at the base), that has been adjusted for proper airflow and the wicking has been taken back to the originals with some minor adjustments on them so they wick even better. cant gaurentee every
juice will work perfect because some juices just arent good for certain systems and those are usually the thick brown stuff or juices with many additives or flavorings that just dont do well in certain
devices, but we tested different
juice ranges and those work just fine. same goes for vg based juices, not all vg juices are the same and thats just a fact and each one can behave differently form brand to brand , everyone has a different recipe, some distill, some dont, some add pga , some dont, some add other things, some dont.