A patient interface device includes a sealing cushion, and a tubing assembly structured to receive a breathing gas from a pressure generating device. The tubing assembly has: (i) a first chamber fluidly coupled to the sealing cushion, the first chamber being structured to deliver a flow of the breathing gas to the sealing cushion, and (ii) a second chamber having a pressure sensing module disposed therein, the second chamber having a closed end and an open end, the open end being fluidly coupled to the sealing cushion such that the second chamber is structured to carry only a positive pressure and substantially zero gas flow.
