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 2925-00-772-5611
NSN 6135-01-603-3657
NSN 4140-00-277-1531
NSN 6105-00-635-9809
NSN 5935-01-566-5825
NSN 5975-00-173-1810
NSN 5930-00-257-5758
NSN 5935-00-910-8239
NSN 5998-00-369-1101
NSN 6240-00-522-3998
NSN 7035-01-383-9357
NSN 5990-01-349-8132