A moisture removal apparatus (10, 100) comprising: a breathing circuit tubing (11, 101) including: a breathing gas conduit (12, 112) that directs a flow of breathing gas in a first direction from a first end of the apparatus (10, 100) to a second end of the apparatus (10, 100); and a dry gas conduit that directs a first dry gas flow; and a moisture transmission pathway between the breathing gas conduit (12, 112) and the dry gas conduit (14, 114) that lowers the humidity of the breathing gas by transferring the humidity to the first dry gas flow; and wherein at least one of: the dry gas conduit (14, 114) directs the first dry gas flow in the first direction; the moisture removal apparatus (10, 100) includes a return conduit that directs a second dry gas flow in a second direction from the second end of the apparatus (10, 100) to the first end of the apparatus (10, 100); or the moisture removal apparatus (10, 100) includes a dividing wall that is flat, the dividing wall dividing the breathing circuit tube into the breathing gas conduit and the dry gas conduit, the dividing wall including a permeable portion that defines the moisture transmission pathway, the moisture transmission pathway being permeable to water vapor. a breathing circuit tubing (11, 101) including: a breathing gas conduit (12, 112) that directs a flow of breathing gas in a first direction from a first end of the apparatus (10, 100) to a second end of the apparatus (10, 100); and a dry gas conduit that directs a first dry gas flow; and a breathing gas conduit (12, 112) that directs a flow of breathing gas in a first direction from a first end of the apparatus (10, 100) to a second end of the apparatus (10, 100); and a dry gas conduit that directs a first dry gas flow; and a moisture transmission pathway between the breathing gas conduit (12, 112) and the dry gas conduit (14, 114) that lowers the humidity of the breathing gas by transferring the humidity to the first dry gas flow; and wherein at least one of: the dry gas conduit (14, 114) directs the first dry gas flow in the first direction; the moisture removal apparatus (10, 100) includes a return conduit that directs a second dry gas flow in a second direction from the second end of the apparatus (10, 100) to the first end of the apparatus (10, 100); or the moisture removal apparatus (10, 100) includes a dividing wall that is flat, the dividing wall dividing the breathing circuit tube into the breathing gas conduit and the dry gas conduit, the dividing wall including a permeable portion that defines the moisture transmission pathway, the moisture transmission pathway being permeable to water vapor. the dry gas conduit (14, 114) directs the first dry gas flow in the first direction; the moisture removal apparatus (10, 100) includes a return conduit that directs a second dry gas flow in a second direction from the second end of the apparatus (10, 100) to the first end of the apparatus (10, 100); or the moisture removal apparatus (10, 100) includes a dividing wall that is flat, the dividing wall dividing the breathing circuit tube into the breathing gas conduit and the dry gas conduit, the dividing wall including a permeable portion that defines the moisture transmission pathway, the moisture transmission pathway being permeable to water vapor.