Mark 2 replacement part, o-ring, niosh/msha, meets ansi/ul 913 standard for intrinsically safe apparatus
NSN 5935-01-499-0544
NSN 5935-01-518-7421
NSN 5925-01-194-1538
NSN 6145-00-360-7760
NSN 5835-00-946-2656
NSN 5999-00-279-4029
NSN 6220-01-419-4954
NSN 5945-01-366-3123
NSN 6620-00-171-4035
NSN 5998-00-456-0864
NSN 7035-01-365-9610
NSN 5915-00-070-9549