Positive Airway Pressure (PAP) devices, which include CPAP and APAP devices, and Respiratory Assist Devices (RAD), which include Bilevel and Bilevel Auto devices are for the treatment of the most common type of sleep apnea, Obstructive Sleep Apnea, or OSA. RAD is prescribed when PAP therapy has been tried and found ineffective or unable to be tolerated. Below are pictures of the products we stock from the market leaders, Resmed and Philips/Respironics.