Josh J I'm curious to know if one of the side ports has an adaptor or comes ready to accept any standard secondary (backup) second stage regulator? I'm sure a second stage failure is extremely rare for this unit, but in case of failure other than free-flow, would the only option be to remove the entire mask and breath from your octo or other redundant air source?
Brett H The side port can accept an adapter that you can attach an octo to, but that is not included with the mask, and we do not sell this accessory.