This thing is amazing!
I have been singing the praises of this simple little muffler since buying the first one a couple of years ago. It greatly reduces the noise that you hear through the tube, and my wife also noticed that the noise that she hears was also much lower, enough so that a couple of times she reminded to hook up my CPAP when it was already running. And the blower, an older Respironics, isn't all that noisy to begin with. If you or anyone nearby is bothered by the sound of your CPAP, this would be worth a try. One caution: the locking tabs on the removable end are not all that tough. I locked mine in place with Bondic. You can still replace the foam insert with long tweezers, sort of like building a ship in a bottle, only much easier.
Reviewed by: Bill Adams from Dodge Center, MN United States on 4/6/2021