Numatic NVM-3AH HepaFlo Dust Dry Vacuum Bags. These are genuine Numatic Hepa-Flo dust bags, designed for use with the Numatic commercial vacuums with a drum size of 27 Litres. 3 layers of material increases filtration. No dust, no mess, what goes in, stays in. The bags are specially designed to offer the perfect fit, this also means it extends the machines life. These come supplied in a pack of 10 each with a 27L capacity per bag. Compatible with Numatic container sizes, 470 Models. Easy to match your machine to its Hepa-Flo bag, look for the numatic seal, above the barcode a code will be present, it contains 3 letters and then 3 numbers, the first 2 numbers indicate the model container (WV 470 or NVQ 470), these bags fit as they fit containers 470. Specifications Capacity - 27L Numatic Code - 604018 Filtration - 3 Layer Hepa-Flo Compatible Container Sizes - 470 Models Pack Quantity - 10 Bags