They are non-existent as of about 6- 7 years ago... No return contacts, they where getting up there in age. And the old style on and off switch's where prone to shocking people.. Just a little buzz but you would jump for sure... lol. I got it many, many times.. lol. If you get a good used one make sure the inside filter is in excellent shape for this is so very important! I have not made one yet but I will... These are The Best Filter Ever Made to this date... I was set-up wholesale with them for years and I have some parts still... Find a used one..! These do work absolutely FANTASIC on CYANO.. Good Luck
