PetSafe ScoopFree Self-Cleaning Litter Box Waste Trap Cover COMPATIBLE LITTER BOXES: Replacement waste trap cover compatible with PetSafe ScoopFree Original, Ultra and Top-Entry Ultra Self-Cleaning Litter Box LOCK ODORS: Traps and keeps odor in the litter box, not in your home HIDE WASTE: Conceals built-in waste trap on disposable litter tray PRODUCT SUPPORT: PetSafe brand's U.S.-based Customer Care experts will be glad to help; call Monday through Saturday at 1-800-845-3274 EXPERIENCE: PetSafe brand has been an industry leading U.S. manufacturer of pet behavior, containment and lifestyle products since 1991, helping millions of people and pets each year