TM 9-2320-209-20-3-3 c. Replacement. FRAME 1 1. 2. 3. GO Working under truck, put stem packing (1) on water tank discharge valve stem (2). Put packing plug (3) on stem (2). Using packing plug as tool, push stem packing (1) into valve body (4). Using wrench, screw in packing plug (3). TO FRAME 2 18-274