Replacement washers for the Still Spirits AirStill or Mr. Distiller carbon filter unit. 10 pack of replacement foam washers for the Still Spirits Air Still or Still Spirits Mr. Distiller carbon filter unit. Washers for the carbon filter unit can be re-used 2 or 3 times before there is a potential for leakage. Mr. Distiller washers may also need to be replaced if they can’t retain their shape any longer. Use these replacement seals to provide a tight fit on your Mr. Distiller carbon filter unit or AirStill carbon collection system. The washer seals the carbon cartridge into the bottle filling funnel.