This is the replacement Eureka ZVac DCF 4 / DCF 18 HEPA Filter for the dust cup of the Eureka Upright vacuum cleaners. This is a 2 pack. The Eureka ZVac DCF 4 / DCF 18 HEPA Filters are designed to perfectly fit within the following Eureka upright vacuum models: 4700, 5500, and HP5550 Replaces OEM part numbers: 63073, 62132, 63073A, and 63073B A great choice for pet owners or consumers with allergies, the Eureka ZVac DCF 4 / DCF 18 HEPA Filter captures 99.97% of allergens, petdander, and other particulates preventing these potential airborne particles from recirculating into the home. GoVacuum recommends for consumers to constantly shake the Eureka ZVac DCF 4 /DCF 18 HEPA Filter out after a few cleanings and replacing it after 5 to7 months of usage. This will promote the best filtration, reduce motor strain, and provide a more well-rounded cleaning experience for your home.