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
At every change of gradient
All of these

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

The water seal is less than that of ordinary traps
It is provided a cleaning eye at the top of the trap
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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