Viking dry vertical sidewall sprinklers are suitable for use in areas subject to freezing. They may be installed either upright or pendent, and are suitable for use on dry systems, preaction systems, or wet systems. They are ideal for use in unheated spaces above ceilings of heated rooms equipped with wet pipe sprinkler systems. NOTE: Viking Dry Vertical Sidewall Sprinklers are NOT listed or approved. VK157, VK161, VK153