The Opus 360 Tube Anchoring Strap Fisher and Paykel 400HC311 is designed to aid in managing your air tube. It aids in anchoring the tube that runs up and over the top of your head. The strap is compatible with the Opus 360 Nasal Pillow Mask. This velcro strap serves to anchor the tube to the top of your head and keeps the tubing secured as you go through sleep apnea therapy.