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This device is designed to hold a cotton ball soaked in your favorite scent locked in a pretty air-flow restricted chamber and then connect that scent to a number of different connectors. Included are connectors for: Standard 40mm nato threaded gasmasks The 'NosePiece' can be used as a stand-alone oral/nasal inhaler, or connected to a standard padded CPR mask. The 'NosePillowAdapter' can be used with a standard 'Nose Pillow' found on Amazon: https://www.amazon.com/dp/B06XGLKFFH/ There is one redundant part in the design depending on how you want to assemble it. Either print the 'ValvePlate' or 'Flat_Plate' but you will not need both. If you print the 'Valve Plate' you will want to glue that part to some kind of light-weight plastic film as either plate is designed to prevent air from flowing backwards through the device. Assembly: First assemble the 'ValvePlate' if you want to use that part instead of the 'Flat_Plate'. Then, place the plate into the 'ValveBody' component (the plate should be loose in the 'Valve Body' so that it forms a one-way airflow seal). Then carefully glue 'ValveBody' to the 'PrimaryBody' - again being sure to allow the plate free-movement. Then you can use any of the other adapters to connect it how you wish.