PurposeUSED TO PLUG THE WASTE WATER DRAIN MAST (FWD & AFT) DURING DRAIN LINE BLOCKAGE REMOVAL/CLEANING, AND USED ON THE 757 WITH B21004 DURING THE CABIN PRESSURE TEST (REPLACED BY C38001 FOR FUTURE PROCUREMENT)Airplane767, 777-200, 777-200ER, 777-300Usage CodeMAINTENANCE 