Niosh approval no. Tc-23c-333; used on american optical models r/s4000, r/s5000, r/s6000 and r/s7000 respirators; sole source required by statute 6.302
NSN 5925-01-258-4640
NSN 5950-01-312-7521
NSN 2925-00-149-0760
NSN 6105-01-030-7979
NSN 6105-01-503-7811
NSN 6135-01-199-1185
NSN 5905-00-541-1471
NSN 2925-01-350-0200
NSN 6220-00-862-6216
NSN 6320-01-446-8050
NSN 5965-01-146-1311
NSN 6685-00-343-8230