MSA10017089 / 10017089 CART WHEELED FOR PORTABLE PortAire® Portable Air-Supply System The PortAire® System holds two standard SCBA air cylinders to provide firefighters, industrial personnel, confined-space workers and others with a portable, compressed-air source any time an airline device is required. Designed for use with MSA pressure-demand supplied-air respirators, including dual-purpose SCBA, the PortAire® System consists of a compact air-pressure regulating system housed in a lightweight yet durable anodized aluminum frame. It includes an Audi-Larm low-pressure warning device, high-pressure regulator and carrying frame with air-supply hose retainer. NIOSH approved.