I use CPAP. I also use SoClean for daily disinfection. When I got my new CPAP, I wanted to replace the tubing that SoClean was using, specifically the part that was in the humidifier. What I ordered is not what I received. Instead I got a much thicker and clearer tube. And stating that what I wanted wasn't available and I was upgraded. The funny thing is that the transparent tube is not what I wanted. It's not flexible enough to work with what I need it for. So basically useless.