Estimating and Costing
The inspection pit or chamber is a manhole provided in a base drainage system

At every 30 m intervals
At every change of direction
All of these
At every change of gradient

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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
The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe
It is provided in between the lower end of the house drain and the street sewer

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