Hudson RCI AquaPak 1,070 mL Nebulizers with 028 Adapter and Water. These nebulizers feature a 028 style adapter that is compatible with only Hudson RCI AquaPak water, allowing for the selection of oxygen concentrations between 28% and 98%. The return tube recycles large particles back to the reservoir to be aerosolized, reducing rainout in the tubing. Prefilled with sterile water. 10/case.