Cartridge, Threaded, OV, CL, HC, SD, HF, HS, CD, FM, AM, MA, Olive, 1 PR, NIOSHMfr #: 75SCL LOW PROFILE: Lower prole so cartridges dont intrude into the work zone, see everything you need to see, even when doing close up detail work. EASY USER CHECK SEAL: Even with the smallest, most petite hands, you can achieve an easy user seal check. No struggling or using adapters to achieve a negative check. COMPATIBLE: Threaded connectors that t North by Honeywell half and full Air Purifying Respirators MULTI CONTAMINENT: Defender Multi