features and benefits: uses just one air line to supply the user with clean filtered grade "d" breathing air from electric shop compressors meets osha 29cfr 1910.134 requirements for providing grade "d" air maintains pressure for use of spray equipment sanders and all types of of air toolsuses just one air line! 90 day limited warranty for defects in materials and workmanship. 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.