18-21. DISCHARGE PIPES REMOVAL AND REPLACEMENT (TRUCKS M49A1C AND M49A2C). TOOLS: 9/16-inch open end wrench 5/8-inch open end wrench 9/16-inch socket 7/8-inch open end wrench 7/8-inch socket 3/4-inch open end wrench Universal joint 10-inch extension Ratchet SUPPLIES: Discharge valve gasket (3) PERSONNEL: TWO EQUIPMENT CONDITION: Truck parked, a. Preliminary Procedure. Drain all fuel to TM 9-2320-209-10. TM 9-2320-209-20-3-3 engine off, handbrake set. from holding compartments. Refer WARNING Smoking, sparks or open flame are not allowed within 50 feet of fuel truck during this task. Fuel may burn, causing explosion, injury to personnel, and damage to equipment. 18-77