A mask assembly that includes a mask frame; a frame connector; a forehead support comprising a tube and a forehead cushion support plate, the forehead cushion support plate extending perpendicularly to a longitudinal axis of the tube; and an adjustment knob movably mounted to the frame connector, wherein the tube is movably mounted to the frame connector for linear movement with respect to said frame connector, and further wherein the tube includes at least one split that allows deflection of the tube when inserting the tube into the frame connector.