Viking Corp. Company Profile | Visit Website 161 Ottawa NWSuite 502Grand Rapids, MI 49503 Products Flat Plate Concealed Company Product Viking Corp. introduces a new 4.0 (58) K-factor residential, flat plate concealed, horizontal sidewall sprinkler. It installs into a standard 2 in. by 4 in. stud wall. Product • December 2nd, 2010 Want to know more about this company? Click here to request more information about Viking Corp. .