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 5925-01-501-4398
NSN 4140-01-421-0071
NSN 6645-00-115-6657
NSN 5855-01-034-3845
NSN 6110-01-326-2541
NSN 2925-01-545-2717
NSN 7035-00-140-0474
NSN 6220-01-519-8837
NSN 6320-01-372-8671
NSN 6130-01-123-9041
NSN 5998-00-932-1607
NSN 5935-00-091-1117