Keeney Plumber's Spec 3.5-in Stainless Steel Rust Resistant Strainer with Lock Mount Included in the Kitchen Sink Strainers & Strainer Baskets department at Lowes.com
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Basket Strainer
3 1/2" Sink Basket Strainer with Fixed Post
Cast Iron Model 30R Simplex Basket Strainer - 125# Flanged - 2"