This is the replacement forehead piece for the Trasncend Travel CPAP Machine. The machine is intended to be worn on top of your head, connected to the mask. The mask's connection features a forehead pad, and this attachment piece connects to that pad.
If you've broken the plastic piece that attaches the Transcend's forehead pad to the mask itself, you'll need a replacement.
It does not attach to any machines. It is a forehead attachment for a CPAP Mask.