The Viking Microfast® Quick Response Upright Sprinkler VK325 is a small, thermosensitive, glass-bulb spray sprinkler is available in multiple finishs and temperatures to meet design requirements. The special Polyester and Electroless Nickel PTFE (ENT) coatings can be used in decorative applications where colors are desired. In addition, these coatings have been investigated for installation in corrosive environments and are Listed/Approved as indicated in the Approval Chart(s)