A patient interface includes a vent structure sized and shaped to maintain the therapeutic pressure in the plenum chamber in use. The vent structure has a vent body configured to direct bending movement in the plenum chamber. The vent body includes a surface with at least one connecting feature. The at least one connecting feature is spaced apart from an outermost edge of the surface. A dampening member is positioned in the vent body and is configured to decrease a noise output. A cover includes at least one complementary connecting feature configured to engage the at least connecting feature of the vent body. The at least one complementary connection feature is radially inside of and spaced apart from the outer diameter of the cover. The at least one connecting feature is configured to engage the at least one complementary connecting feature so that neither are visible in use.