CDCLarue Accessories (103621) - Twist-On HEPA H-13 Replacement Filter Kit (3 ea. per kit) H-13 HEPA Rated twist on/off filters made of a spun bond polyester media with a P.T.F.E coating Fits 1000 Series Vacuums Easy to replace just screw on and off Only available for the Pulse-Bac Dust Collection Units Great for 1050, 1150 and 1250 Vacuums | More durable than any filter on the market today Made of a Spun Bond Polyester that is long lasting with a wax type coating