Engine : General Subjects - 1682/1128
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| Which of the valves listed for the device shown in illustration will be open while the unit is operating in the back flush mode? Illustration GS-0153 |
| A) valve "4" |
| B) valves "4" and "5" |
| C) valves "4" and "14" |
| D) valves "4", "5", and "14" |
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Illustration GS-0153
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