Item 37474 - Airstart, Airsense 10 and AircurveST, and ASV machines. Item 37344 - Aircurve ST-A and RPS II machines. The Power Supplies are external power device that supplies power to your Air10 series machines. Both of the power supplies include the power device itself and a connecting cord. AirStart/AirSense and AirCurve ST-A. ResMed's AirStart, Airsense10 and AircurveST, and ASVmachines now have a new lighter power cord and is item 37474. This lighter cord will be especially handy if you take the machine traveling with you, as this supply is significantly lighter than the previous. However, the AirCurve ST-A Machines will still use item 37344. These machines are the ResMedmanufacturer's latest lines of CPAP and BiLevel devices.