I've had my protanks 1 for over 2 months and NEVER had a flooding problem always get my replacment heads from the same place and dump them in a tin so I dont know one month from another. Well this wrek no matter what I do (removing flavor wicks adding flavor wicks turning the grommet over and so on) I've used it on a vamo and a mechanical it has flooded on on both! do they wear out? I have no desire to rebuild!