Vacmaster HEPA Cartridge Filter for VK1638SWC-01L WD L38Genuine Vacmaster certified HEPA 13 cartridge filter for VK1638SWC 01L L38 Dust Extractor. Maintain your vacuum's filtration performance with a genuine Vacmaster HEPA 13 media cartridge filter. Dense filter with a large surface area for capturing fine dust and allergen particles, removing at least 99. 97% of air particles as small as 0. 3 microns in diameter. Clean by tapping and then brushing the dust away. Replace at regular intervals to maintain