No, not all sink aerators are removable. While the vast majority of standard residential kitchen and bathroom faucets feature a threaded tip that unscrews easily for cleaning or replacement, certain modern designer fixtures, commercial pull-down sprayers, and tamper-proof public restroom taps feature sealed spouts where the aerator is permanently built into the nozzle housing and cannot be detached. Verification: Check the spout tip for visible threads, grooves, or flat edges indicating a removable collar.
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