Fixed pressure CPAP machines Australia for sale. Here you will find a great range of continuous positive airway pressure CPAP machines from world leading CPAP manufacturers available in Australia today. These machines deliver a set fixed constant pressure throughout the night. They are much more affordable than your fully automatic CPAP machines. They all have a ramp feature so the CPAP air pressure will start off at a lower pressure to ease you into your prescribed CPAP set pressure for treating your obstructive sleep apnea symptons.