Mark 2 replacement part, o-rings, (2), niosh/msha, meets ansi/ul 913 standard for intrinsically safe apparatus
NSN 5975-01-534-7807
NSN 5905-01-252-8147
NSN 5835-01-373-3498
NSN 5895-01-142-5706
NSN 5999-00-917-2367
NSN 5996-00-614-9310
NSN 5998-00-455-9905
NSN 6145-00-502-1828
NSN 4140-01-122-4050
NSN 5855-01-187-2293
NSN 5960-00-076-5546
NSN 6110-01-004-9870