TM 9-2320-209-20-3-3 18-49. HOSE COUPLING GASKET REMOVAL AND REPLACEMENT (TRUCK M49A1C). WARNING Smoking, sparks, or open flame are not allowed within 50 feet of work area during this task. Fuel may burn, causing explosion, injury to personnel, and damage to equipment. TOOLS: 2 11/16-inch open end wrench 2 1/4-inch open end wrench SUPPLIES: Hose coupling gasket PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Removal. FRAME 1 1. Using 2 11/26-inch wrench, hold nut (1). Using 2 1/4-inch wrench, unscrew coupling nut (2) from pipe (3). 2. Take hose (4) away from pipe (3). GO TO FRAME 2 18-251