Direct answer: Check the model code printed on your Shark styler against the compatibility list on the exact replacement attachment page. “FlexStyle round brush” is not precise enough: Shark’s U.S. store lists two round-brush accessory SKUs with different model-code groups.
Scope: This guide compares the compatibility lists shown on two U.S. SharkNinja product pages checked on October 17, 2026. It does not confirm stock, shipping, warranty coverage or electrical compatibility in another country.
Two round brushes, two model-code lists
| Official accessory listing | Model/SKU shown | Compatible styler models listed on page |
|---|---|---|
| Shark FlexStyle Round Brush, Stone | XSKHD4RBA | HD400, HD410, HD420, HD430, HD430C, HD435, HD440, HD440KR, HD446Q, HD430REF, HD435REF, HD432PK |
| Shark FlexStyle 43 mm Round Brush, Black | 398LX400 | HD450TL, HD450TLC, HD442OR, HD444BP, HD432PL, HD432EM, HD461BK, HD464HBP, HD444BPC, HD445BKCCO, HD432EMC |
Both pages use the FlexStyle name, but the lists are not identical. That is why a listing title or a product photo alone should not be used to infer a fit. The first page identifies XSKHD4RBA and the HD4XX-era model list; the second identifies 398LX400 and a different set of variants. Shark describes the second brush as a 43 mm tool for styling shorter hair and bangs, but the fit check still starts with the styler model code.
How to check compatibility in four steps
- Find the styler model code. Look at the product label or original box and copy the complete code, including letters at the end. Do not shorten HD432EMC to “HD432” or treat HD430 as interchangeable with every FlexStyle variant.
- Open the exact accessory page. Record its accessory model/SKU, not only “round brush,” “diffuser” or “FlexStyle attachment.” The official page may list several accessory versions with different fits.
- Compare the full string. Match every letter and suffix against the compatibility list. If the model is absent, do not infer fit from appearance or a retailer’s generic title; ask Shark support to confirm the exact pair.
- Check your market separately. These pages are from Shark’s U.S. storefront. A regional product can have a different model code, plug, voltage or accessory bundle. Confirm the local support page and product label before buying or attempting to use an attachment.
What this comparison does—and does not—tell you
It demonstrates that two accessories sold under the same family name can have distinct published compatibility lists. It does not establish that every FlexStyle model belongs to one of these lists, that a matching product is currently in stock, or that all attachments are safe to use on a different Shark styling system. The HD430 product page itself lists 120 volts for that specific U.S. unit; that figure should not be generalized to a different model or market.
If an attachment will not lock in smoothly, stop rather than forcing it. Check the manual for the exact model and contact the manufacturer if the fitting or compatibility remains uncertain. Do not operate a styling tool with a loose, damaged or incorrectly attached accessory.
A simple purchase note to keep
Before ordering, save a small record with the styler’s complete model number, the attachment SKU, the exact official compatibility line, your country storefront and the date you checked. This makes it easier to resolve an order mismatch without relying on broad product-family language.
Official sources
- Shark FlexStyle Round Brush, SKU XSKHD4RBA — official U.S. accessory model list.
- Shark FlexStyle 43 mm Round Brush, model 398LX400 — separate official U.S. accessory model list.
- Shark FlexStyle HD430 product page — example of the model number and U.S.-market voltage fields on a product listing.
Official U.S. pages checked October 17, 2026. Compatibility lists and availability can change; this article does not test accessories or verify regional products.
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