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Question
Pick up the incorrect statement regarding a master trap from the following:
Options:
A .  It is provided in between the lower end of the house drain and the street sewer
B .  It is provided a cleaning eye at the top of the trap
C .  The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe
D .  The water seal is less than that of ordinary traps
Answer: Option D

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