For the US-market Shark BU3521, manufacturer listings name 7 OEM part records for this exact code across batteries, brushes, filters, nozzles and attachments. Verify the complete code on your machine before choosing a component.
Source-backed parts
| Part | Type | Fit status | Why | Source |
|---|---|---|---|---|
| XBTR625KSLN Auto-Empty System Battery Pack | Batteries | Verified fit | Manufacturer lists this exact model for this part. BU3120 has different generations. The manufacturer requires checking the existing battery model and voltage rating. | SharkNinja ↗ |
| 349CH1000 PowerFins Brushroll | Brushes | Verified fit | Manufacturer lists this exact model for this part. The official 349CH1000 page names 8 exact model codes. This record concerns the brush roll; check the original component and full suffix. | SharkNinja ↗ |
| XPRFIW1000 Handheld Vacuum Pre-Motor Filter | Filters | Verified fit | Manufacturer lists this exact model for this part. The official XPRFIW1000 page names 16 exact model codes. This record concerns the pre-motor filter or kit; check the original component and full suffix. | SharkNinja ↗ |
| 352CH3111C Duster Crevice Tool | Nozzles And Attachments | Verified fit | Manufacturer lists this exact model for this part. The official 352CH3111C page names 3 exact model codes. This record concerns the crevice attachment; check the original component and full suffix. | SharkNinja ↗ |
| 353CH1000 Crevice Tool | Nozzles And Attachments | Verified fit | Manufacturer lists this exact model for this part. The official 353CH1000 page names 15 exact model codes. This record concerns the crevice attachment; check the original component and full suffix. | SharkNinja ↗ |
| 355CH1115 Wide Upholstery Tool | Nozzles And Attachments | Verified fit | Manufacturer lists this exact model for this part. The official 355CH1115 page names 7 exact model codes. This record concerns the upholstery attachment; check the original component and full suffix. | SharkNinja ↗ |
| XFBU3000 Auto-Empty System Pre-Motor Filter Assembly | Filters | Verified fit | Manufacturer lists this exact model for this part. The official XFBU3000 page names 2 exact model codes. This record concerns the pre-motor filter or kit; check the original component and full suffix. | SharkNinja ↗ |
The listed OEM numbers come from manufacturer product material. Similar codes can have different parts, so compare the complete machine label with each linked source.
Compare a nearby model code
Our checked listings for BU3521 and BU3120 do not show exactly the same parts. The rows below describe differences in this catalog, not proof that an unlisted part cannot fit. Open each manufacturer page before ordering.
| Code | Part numbers listed here but absent from the other code’s checked list |
|---|---|
| BU3521 | XBTR625KSLN |
| BU3120 | None in this catalog |
Coverage and limits
These source listings cover the components shown above. Different components still have separate OEM numbers and care instructions. The current manufacturer listing and the full machine label control the final check.
Before you buy
- Read the full model code on the machine label.
- Open the linked manufacturer source and compare the part number.
- For powered parts, compare the generation, voltage, and connector where applicable.
SharkNinja: Auto-Empty System Battery Pack XBTR625KSLN ↗.
Manufacturer listings can change. Verify your machine label and the current product page before buying.
We have no verified data for other part types on this model. An empty category is not a compatibility claim.