Viking is a proud world leader in the design and manufacturing of life-saving fire sprinklers. The VK540 Standard Response High Challenge® Upright Sprinkler is just one of thousands of industry-leading sprinklers available to customers! The VK540 is a thermosensitive, glass bulb sprinkler intended for use in protecting high piled storage occupancies in accordance with NFPA 13 rules for CMSA sprinklers (formerly known as Large Drop) and FM Global criteria for non-storage and storage sprinklers.Sift through virtually every sprinkler in a flash with the revolutionary Sprinkler Selector! Select various criteria, such as K-factor, occupancy type, orientation, temperature and more, to get the part number you need. Test it out today and streamline your projects!