I got my CPAP from the Lincare on Front Street in Tyler, TX. A gentleman brought the CPAP machine out to my house and showed me how to use it. He had 2 sizes of a face mask. He put the one he thought would fit on and turned on the machine. Even though the machine was only set to the lower pressure ramp setting the mask could not be adjusted to stop a loud vibrating leak. He tried the second mask on me, same thing. He said those were the only two masks authorized by my Doctor and asked me to try it for a couple of weeks saying he would... read full review »