cast steel or stainless steel
steam trap bimetallic design

design description:
  compact structure, easy to install and maintain,
  resistant to waterhammer and freezing,
  condensate released ate below saturation
  temperature reducing amount of flash steam,
  available adjust in using temperature
  no noise when working
  continuing drain characteristic,
  design: factory standards.
  fluid application: vapor, condensation.
  media minimum temperature: 50°c
  end thread: npt or other.