TM 9-2320-209-34-2-3 21-25. DEEP WATER FORDING EXHAUST EXTENSION GASKET REMOVAL AND REPLACEMENT. TOOLS: No special tools required SUPPLIES: Exhaust extension gasket PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Removal. FRAME 1 1. Take off three nuts (1) and three screws with washers (2). 2. Take off lower exhaust extension (3) and gasket (4). Throw away gasket. END OF TASK 21-197