Viking EC/QREC Ordinary Hazard ELO Fusible Element Pendent Sprinkler VK537 is a thermosensitive spray sprinkler available in several different finishes and temperature ratings to meet varying design requirements. The extra-large orifice produces the flows required to meet Ordinary Hazard density requirements at lower pressures than standard orifice or large orifice sprinklers. Pendent Sprinkler VK537 is UL Listed as standard response and quick response. 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 approved as indicated in the approval chart.