The size of the rainwater pipe commonly used in house drainage is _____

One pipe system is cheaper than the single stack system for the drainage of buildings.

In a house drainage system, the pipe which is used to preserve the water seal of traps is called ______

The length of the bathtubs generally varies from _______

Which of the following is not a characteristic of traps?

The diameter of main service pipe may vary from _______

The outlet pipe in the septic tank is kept about _____ lower than the inlet pipe.

Light gauge copper tubes are used for general purpose work where the pressure is not more than 0.15 N/mm2.