The Viking Microfast® Quick Response Upright Fusible Element Sprinkler VK351 is a small, thermosensitive, solder link spray sprinkler available in several different finishes and temperature ratings 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, the ENT coating has been investigated for installation in corrosive environments and is Listed/Approved as indicated in the Approval Chart(s).