This Type-C, supplied-air respirator supplies a continuous flow of air to the facepiece from an external source. The complete assembly is available with either an: Advantage 4000, Ultravue or Ultra Elite Full Facepiece, Comfo Half-Mask Facepiece or Comfo Welder's Facepiece, plus breathing tube, web support belt and air flow control valve. Use only in non-IDLH environments.