#$%^&*AU2015100863A420150730.pdf#####Abstract A device for positive expiratory pressure includes a relief valve to enable effective training in the use of the device and the avoidance of choking. The device includes a vessel； a vessel conduit disposed inside of the vessel； a mouthpiece conduit connected to the vessel conduit； and a relief valve in fluid communication with at least one of the vessel conduit and the mouthpiece conduit. In use the relief valve is configurable between an open position and a closed position.1/3 U-Up'. cc m L
