There are many important elements used in our ozone generators.  Ozone is a fairly corrosive gas, and will rust or corrode connections over time.  There are many producers using zinc or copper fittings believing that you must replace your equipment anyway.  We decided a long time ago to use the most anti-corrosive parts possible.  For wire connections, we not only solder, we seal with tape and heat shrink to seal out all air.  We apply an anti-corrosive paste to any exposed metal part that comes with a fitting.