do not get it [SEP] i was disappointed in this because it did not seem to be much different from the regular nozzle i use all the time i even turned the water all the way up and it did not blow the nozzle off as predicted since i have been getting rave reviews at the dentist i think i will just stick with the regular nozzle so much easier than having to switch refill switch back for the next time actually i can keep them for replacements if when my regular ones wear out if they ever do