The 55376A HEPA Central Vacuum Bag 2-pack fits the following VacuMaid, Astro Vacuum and Air King central vacuum models: SR36C, SR36, SR50, SR52, H-1P, P70, SR38, P80, H2, P73, P75, MK-IP. Further, the bags fit Valet models AT100, AT120, ATQ300, ATQ160, ATQ180, ATQ1500, ATQ4000. These bags are premium OEM quality replacement bags. They are made with HEPA 11 material, providing superior filtration. This HEPA quality makes it ideal for use in homes with pets and allergy sufferers.