Over priced - it appears to be a $0.25 piece of hard plastic. But the hose and headpiece that came with my ResMed AirMini travel CPAP made it so incredibly loud, I couldn’t sleep. This universal adapter lets me bypass the heated hose connection, and use the hose and headpiece from my ResMed 10 on my AirMini travel CPAP. It’s significantly quieter overall without the noise of the air whistling through the HumidX “waterless humidifier.” It’s still much louder than my ResMed 10, but much improved with this adapter.