CPAP Mask Continuous positive airway pressure (CPAP) therapy is a common treatment for obstructive sleep apnea. A CPAP machine uses a circuit, face mask, or nasal mask to deliver constant, steady air pressure. Elastic breathable headbandAdaptive Silicone PadMatrix ventsUniversal turning elbowQuick operation headband buckleQuick plug connectorMedical PC + Liquid Silicone + Medical PP Requst A Quote Specification Type 1: Vented, with anti-blocking holes (1 pc connector, Grey color male)Type 2: Not Vented, 2 pcs connectors, grey colored male type, and Blue colored female type.Tube compatible: φ22mm (ISO 5356-1)Resistance: Drop in pressure measured at 50L / min ≤1 cmH2O; at 100L / min ≤2 cmH2OSound: Less than 35dBASize S: 175.9mm (height) × 110mm (width) × 112.5mm (thickness)Size M: 183.9mm (height) × 118mm (width) × 114.5mm (thickness)Size L: 194.9mm (height) × 122mm (width) × 114.5mm (thickness) You May Like Breathing Filter Laryngeal Mask Airway Endotracheal Tubes Breathing Circuit