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Kohler, Sink Strainers.
From the Manufacturer
This KOHLER stainless sink strainer is removable and features solid brass construction for durability. Install it in sinks with 3-1/2-Inch or 4-Inch outlets. An open/close stopper that seals tightly makes this strainer convenient and reliable.
KOHLER K-8814-CP Stainless Steel Sink Strainer Polished Chrome - B0015J8SH2