TM 9-2320-209-34-2-3 21-23. DEEP WATER FORDING AIR PRESSURIZING SYSTEM REGULATOR VALVE REMOVAL AND REPLACEMENT. TOOLS: No special tools required SUPPLIES: None PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off and cool, handbrake set. a. Preliminary Procedure. Open hood. Refer to TM 9-2320-209-10. b. Removal. FRAME 1 1. Unscrew nut (1). 2. Take off hose (2) from valve inlet,(3). 3. Take out valve outlet (4) from nipple (5). GO TO FRAME 2 21-186