DRS-4500 Deployable Breathing Air System Refill Stations from authorized suppliers. The requirement is for three (3) DRS-4500 Deployable Refill Stations (Part ID AMTC-X0084). These units provide porta... DRS-4500 Deployable Breathing Air System Refill Stations from authorized suppliers. The requirement is for three (3) DRS-4500 Deployable Refill Stations (Part ID AMTC-X0084). These units provide portable, high-pressure breathing air refill capability for aviation and emergency response operations. Units must be new, OEM-compliant, and delivered ready for operational use. Please see sources sought document for more information.