Viking Microfast® Quick Response Stainless Steel Sprinklers are small, corrosionresistant, thermosensitive, glass-bulb spray sprinklers. The design consists of a solid stainless steel frame and deflector, combined with a nominal 3 mm glass-bulb operating element and a specially plated spring. These sprinklers can withstand many harsh corrosive environments that may cause regular brass sprinklers to deteriorate.