Question on toilet valve


I went to the hardware store to replace my toilet valve which has a 1/2" tube inlet, but the one that fits is a 5/8" tube inlet. Why does the package say 1/2" if 5/8" fits.,unless it refers to the adapter screwed on the end.Just a newbie trying to understand sizing. Thanks.
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Half inch copper will not go dierectly to the ballcock unless it is a brass one other wise it is a 5/8ths femm thread fitting . 1/2 copper pipe is 5/8ths outside diameter snipped-for-privacy@hotmail.com wrote:

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