VBA code to delete rows if a specific value is not present

Hello,

I'm trying to write a macro to update a report including deleting all rows that do not contain a specific value of TP in column K. I've searched the web and found various suggestions none of which are working for me. Below is one of the examples. Any ideas?

'If Application.CountIf(Range("K:K"), 0) <> "TP" Then
'Rows(3).Resize(3).Delete
'End If

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