Estimating and Costing
The trap which is provided to disconnect the house drain from the street sewer is called

Interception manhole
All listed here
Intercepting trap
Master trap

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Estimating and Costing
Pick up the incorrect statement regarding a master trap from the following:

It is provided a cleaning eye at the top of the trap
The water seal is less than that of ordinary traps
It is provided in between the lower end of the house drain and the street sewer
The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe

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