| 1 | Close the control valve (23). | |
| 2 | But for every commitment, there was also a trap door; | |
| 3 | Open the fill and overflow valve, then close the valve. | |
| 4 | Disconnect the air pressure source from the air valve at the water service panel. | |
| 5 | He can open and close the door with negligible work. |
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