NOS Parker compressed air filter element. Filter Type Aerolescing, Filter Rating 0.01 micron, Filter Element Material Microglass, Filter Efficiency 99.97 Percent, For Fluid Type Compressed Air and Gas, For Substance Type Air; Gas, Series HN8S. These came out of storage of excess inventory and boxes are rough, but filters are sealed in plastic. Four available. 18-3/4" x 3-1/8"