A respiratory nasal pillow mask (1) useable for treating respiratory failures or disorders, such as sleep apnea or the like comprising a mask body (10) comprising a central opening (11) and an outer surface (13), and a flexible nasal cushion (20) comprising a pair of hollow nasal prong (21), said nasal cushion (20) being detachably coupled to the mask body (10). The nasal pillow mask further comprises a poka-yoke coupling system (12, 25) and a magnetic connecting system (2, 3) cooperating together for ensuring an efficient coupling of the flexible nasal cushion (20) to the mask body (10). The invention further concerns a respiratory gas delivering assembly comprising a gas source, preferably a CPAP or BPAP device, delivering a pressurized respiratory gas, such as air under pressure, and a respiratory mask (1) according to the invention.
