DESC: Uses just one air line! The Pure-Air-Breathing System is a breakthrough in respiratory protection! WARNING: Not for use in (IDLH) Immediately Dangerous to Life and Health atmospheres, or with gasoline/kerosene powered compressors. DO NOT operate at levels above 300 PSI. SAS Safety Corp. recommends using a high quality oil and water separator prior to installation of Pure-Air 2000. 2001-01 System Contents: SAS2001-01 Pure Air Filtration Unit; SAS3626 6' Work Line Hose; SAS9850-31 - Nylon Web Belt.