Purchasing a traditional replacement ballcock assembly or a modern universal toilet fill valve typically costs between $10 and $25 at any local hardware store, home improvement center, or online plumbing supplier. While traditional old-style brass ballcock assemblies featuring separate metal float arms can sometimes command a slightly higher price due to their heavier metal construction, standard modern plastic replacement fill valves are remarkably inexpensive, highly standardized, and designed for universal compatibility across most residential toilet models.
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