A tubing assembly for use with a patient interface device includes a manifold portion structured to be coupled to a conduit carrying a flow of breathing gas and a number of tubular portions. Each tubular portion extends from the manifold portion to a distal end which is structured to be coupled to the patient interface device. Each tubular portion is structured to communicate the flow of breathing gas from the manifold portion to the patient interface device. Each tubular portion comprises an adjustment element which provides for a characteristic of the tubular portion to be selectively varied.