I'm assuming you are talking about a p-trap. A p-trap is a fitting that holds water to block sewer gasses from entering the building through the fixture. Every fixture with a drain has to have one in the waste. A toilet has what you would call an "s-trap" built into it. It serves the same purpose as a p-trap.
Drum ,bottle, S, and traps that depend on moving parts
"P" Trap after that would be running traps
You have to take the floor apart and reduce the piping to 2". You also have to install a p-trap as there are NEVER p-traps under toilets. All p-traps are BUILT into toilets!!!
no. they're legal and not regulated, but police tend to lean to towards the citation side instead of the warning side when they see them
they set up squirrel traps, raccoon traps, rabbit traps and beaver traps
Legal or non legal (licensed)
they used deadfalls and pit traps
Plug waste, gully, traps, waste pipes, waste pumps.
Plumbing drain vents equalize the pressure in drain piping in order to preserve trap seals on plumbing fixtures. Blocked or improperly sized vents can cause traps to dry allowing sewer gases to enter the building.
S Traps is garbage as it can self syphon P traps are legal
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A trap is a bend in the pipework that keeps a constant level of water in a drainage or waste system. This stops smells and fumes coming back up the drains and through your plug hole or toilet pan. Types of traps are bottle traps, P traps and S traps to name a few. Hope that helped :)
One trap for each fixture and one main trap prior to leaving the structure