TM 9-2320-361-10 2-27. OPERATION OF WATER TANK TRUCKS (Contd) (8) Push compartment valve levers (14) forward, to closed position. (9) Use hydrant wrench (19) to turn hydrant valve (18) left, to open position. (10) Insert nozzle (21) in filler hole (11) and till as needed. Check water level with gage ( 13). (11) After filling tank, remove nozzle (21), close filler cover (10), secure cover clamp (12) and install padlock (16). (12) Secure water level gage (13). 2-123