Photo 1 of BU3523 BU3521 BU3120 HEPA Filter Replacement Compatible with Shark BU3521 Clean Lightweight Cordless Stick Cleaner, Shark BU3523 Clean and Empty Cordless Stick Vacuum and Auto Empty System (2 Pack)

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Photo 1 of BU3523 BU3521 BU3120 HEPA Filter Replacement Compatible with Shark BU3521 Clean Lightweight Cordless Stick Cleaner, Shark BU3523 Clean and Empty Cordless Stick Vacuum and Auto Empty System (2 Pack)Photo 2 of BU3523 BU3521 BU3120 HEPA Filter Replacement Compatible with Shark BU3521 Clean Lightweight Cordless Stick Cleaner, Shark BU3523 Clean and Empty Cordless Stick Vacuum and Auto Empty System (2 Pack)