Which one of the following pairs is not correctly matched ?

1.	Which one of the following pairs is not correctly matched ?
A.	Check valve - To check water flow in all directions
B.	Sluice valve - To control flow of water through pipe lines
C.	Air valve - To release the accumulated air
D.	Scour valve - To remove silt in a pipe line
Answer» C. Air valve - To release the accumulated air

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Which one of the following pairs is not correctly matched ?

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