TM 10-6640-215-13 2-8. OPERATING PROCEDURES- continued. 4 Tank fill or water system directional flow valve - OPEN to Water System 5 Main water valve from pump - OPEN 6 Water tank drain valve - CLOSED 7 Supply system valve and petcock (3) - CLOSED 8 Pump suction valve from water  - CLOSED tank (g)   Open valve at supply source. (h)   Place pump switch at the water pump controller to ON. (i) Open faucet at sink to purge air from system. (j) When solid stream of water is flowing, shut faucet and check system for leaks. (5)   Operate the Water System to Supply Water For Outside Use. (a)   Unlatch and open UTILITIES box access door. (b)   Connect garden hose adapter to water system connector. (c)   Attach 50-foot (15.25 m) garden hose to adapter. (d)   Attach opposite end of hose to tank, container, etc.  to be filled. (e)   Position water inlet/outlet selection valve to the OUT position. (f)    In the mechanical room, position the water system valves as follows: 1 Pump suction valve from tank - OPEN 2 Water tank drain valve - CLOSED 3 Supply system valve and petcocks (3) - CLOSED 4 Pump suction or tank fill directional control valve - CLOSED   to  Pump suction 5 Tank fill or water system directional control valve - CLOSED to tank 6 Main water valve from pump - OPEN 2-53