TM 9-2320-209-20-3-3 18-53. DISCHARGE VALVE REMOVAL AND REPLACEMENT (TRUCKS M50A1, M50A2, AND M50A3). NOTE This task is shown for the front discharge valve. This task is the same for the front and rear dis- charge valves. TOOLS: 9/16-inch open-end wrench (2) Cross-tip screwdriver (Phillips type) Pliers 9/16-inch socket 10-inch extension Universal joint Ratchet SUPPLIES: Discharge valve gasket Discharge valve-to-tank drain pipe gasket PERSONNEL: TWO EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Preliminary Procedure. Drain water from tank body. Refer TM 9-2320-209-10. to 18-263