The waste outlet of the bathtub is connected to the sullage pipe through

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Types of traps

1- intercepting traps generally used between manhole outlet and public sewer, so that the sewer doesnot enter the house sewer line through manhole. water seal is about 100mm

2- p trap name after its shape ,water seal 25mm to 75mm

3- gully trap used in horizontal sewer line , placed in already built masonry chamber , made upof stone ware cover with cast iron grating, water seal 60mmto 70mm

4- floor trap  generally used in kitchen bathroom sink, made up of pvc or cast iron , water seal depth 50mm