The Cord Keeper allows you to organize your pump power cord, ozone tube, and temp probe wire, if you run them over the rim of your chest freezer cold plunge. It also minimizes any gap in the lid seal for better efficiency.
Many prefer this approach, as you avoid drilling a hole in your freezer's lid. Please be aware that you may still have to modify the rim of your freezer to avoid it pinching the ozone tube when it shuts.
