The Plumber's Choice 3-1/2 in. Strainer Basket Replacement for Kitchen Sink Drains Stainless Steel with Stopper and Rubber Seal (2-Pack) RB12157x2 - The Home Depot
McALPINE Basket Strainer Plug Waste WASHER ONLY Seal for Kitchen Sink Plug | eBay
Replacement Lira Rubber Seal Sink Waste Plug Washer For Franke Basket Strainer | eBay
KONE Sink Drain Assembly, Kitchen Sink Drain Strainer Kit with Removable Strainer Basket Stopper, Universal fit USA Home/Commercial 3-1/2 Inch Standard Sink Drain Hole (Polish) - Amazon.com