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When the pipe goes down, and back up, and back down again, the first "up-curve" is called the trap because when the water goes down the drain, not all of it goes back up and down again (thanks to gravity). So there is a little bit of water there and it prevents any gas/odors from coming back up the sewer pipe. Provided that the pressure on the sewer-side of the trap does not exceed atmospheric pressure on the drain-side, the water will not get forced back up. Provided that the water is not allowed to evaporate, there will always be water there. And provided that there is enough water such that the top of the inside curve of the up-turn is lower than the top of the trapped water level, the trapped water will seal out the sewer gas.
What else can I help you with?
What is p trap?
In plumbing, a trap is a U-, S-, or J-shaped pipe located below or within a plumbing fixture.
How to test plumbing trap?
Turn on the the water to the fixture. And let in run.
What are plumbing drain vents?
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.
When was the sink trap invented?
1743 in England for the Duke of York and if you need the exact month check out the history of plumbing
What is a legal and common used trap?
building codes in the jurisdiction may require you to use a certain type of trap in certain plumbing designs.A bell trap is used in floor drains (although this particular trap is sometimes erroneously installed in a drainage system).Answers.comAnswers.comAnswers.com. So is a drum trap. S traps are much more common.A p trap is used for sinks
What is a suitable p-trap alternative for plumbing installations?
An alternative to a traditional p-trap in plumbing installations is a bottle trap.
Which is the most common used trap in plumbing?
a "p" trap
What is p trap?
In plumbing, a trap is a U-, S-, or J-shaped pipe located below or within a plumbing fixture.
What is the best trap to use for plumbing?
A Vented Running trap with two clean outs or a P trap.
What is the purpose of the under sink trap in a plumbing system?
The purpose of the under sink trap in a plumbing system is to prevent sewer gases from entering the living space and to trap debris to prevent clogs in the pipes.
What are the differences between a J trap and a P trap, and which one is more suitable for my plumbing needs?
The main difference between a J trap and a P trap is their shape. A J trap has a shape resembling the letter "J" while a P trap has a shape resembling the letter "P". In terms of suitability for plumbing needs, the choice between a J trap and a P trap depends on the specific requirements of your plumbing system. P traps are more commonly used in modern plumbing systems due to their effectiveness in preventing sewer gas from entering the building. However, J traps can be suitable for certain situations where space constraints or specific plumbing configurations make them a better option. It is recommended to consult with a professional plumber to determine the best trap for your specific plumbing needs.
What is the purpose of an offset p trap in plumbing systems?
An offset P-trap in plumbing systems is used to prevent sewer gases from entering a building while allowing wastewater to flow out.
What is the standard height for a washer trap in a residential plumbing system?
The standard height for a washer trap in a residential plumbing system is typically around 6-8 inches above the floor level.
What are the different sink pipe parts needed for a plumbing project?
The different sink pipe parts needed for a plumbing project include the P-trap, tailpiece, trap arm, and the sink drain.
What is the standard size of a 2 inch p trap used in plumbing installations?
The standard size of a 2-inch P-trap used in plumbing installations is typically 2 inches in diameter.
What distance from side and back wall should an s trap drain be located?
An S trap is not allowed in a plumbing system. Only a P-Trap
What are the differences between a J trap and a P-trap in plumbing systems?
The main difference between a J-trap and a P-trap in plumbing systems is their shape. A J-trap has a J-shaped bend, while a P-trap has a P-shaped bend. Both traps are used to prevent sewer gases from entering the building, but the shape of the trap can affect how well it functions and how easy it is to clean.
