A faucet flow restrictor typically looks like a small, brightly colored plastic disk, a perforated mesh screen insert, or a rubber flow-control washer housed directly inside the removable aerator tip at the end of the faucet spout. Its purpose is to physically constrict the diameter of the water pathway, limiting the volume of water passing through per minute while mixing air into the stream to maintain pressure. Verification: Unscrew the aerator housing from the spout and look inside the threaded collar to identify the internal restrictor insert.
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