PurposeUSED TO PLUG PRESSURE RELIEF VALVE DOOR OPENINGS VENT SCOOPS IN LOWER OUTBOARD WINGS, IN THE SURGE TANK AREA FOR FUEL PRESSURE SEAL TEST IN ALL TANKS IN CONJUNCTION WITH F72951 WATER MANOMETERAirplane747, 777-200, 777-200ER, 777-200LR, 777-300, 777-300ER, 777-8, 777-9, 777F, 787-10, 787-8, 787-9Usage CodeMAINTENANCE 