Special Notice: DEPT OF DEFENSE is procuring REGULATOR OXYGEN, DI for aircraft air conditioning, heating, and pressurizing equipment. This item, with National Stock Number (NSN) 1660-01-508-8023BO, is used to regulate oxygen flow in aircraft systems. The procurement is being handled by DLA AVIATION OKLAHOMA CITY, a sub-tier of DEFENSE LOGISTICS AGENCY. For more information, refer to the provided MIL-PRF-83178-2 EDL drawing.