American Standard 4311.023.002 Commercial Perforated Grid Strainer Drain for 3-1/2-Inch Outlet Sink, Chrome Less Adapter Includes two nuts, one each: 1-1/2 inch x 1-1/2 inch washer and 1-1/2 inch x 1-1/4 inch washer Polypropylene) United states For 3-1/2-Inch outlet sink 1-1/2-Inch tailpiece Commercial grade Chrome American Standard