Kohler K-8799-BN Brushed Nickel Duo Strainer Tailpiece. This Duostrainer sink strainer is a genuine product manufactured by Kohler. This Strainer features a durable brass construction throughout the entire body. This durable removable basket strainer also features an open & close stopper designed for a tight seal. The Kohler K-8799-BN Brushed Nickel Duo Strainer Tailpiece is ideal for sink installations with 3-1/2 in. or 4 in. outlets.