Engine_2014 : General Subjects - 1252/3524
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| The valve shown in the illustration is designed to seal against positive pressure leaks around the valve stem by the use of __________ . |
| A) a two piece rotating mechanical seal |
| B) rubber "O" rings |
| C) an external sealing line |
| D) adjustable packing gland |
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Illustration GS-0047
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