Viking Microfast® HP Quick Response Fusible Element Horizontal Sidewall Sprinkler VK320 is a small thermosensitive solder link spray sprinkler available with various finishes and temperature ratings to meet design requirements. For light and ordinary hazard occupancies. 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 Charts.