You attach the p-trap directly to the drainage and manuever the p-traps exits into you existing drain. It is not ideal to have the p-trap below the the exit drain because water gravity has to force the water out instead of it flowing downwards naturally. They both work and have seen it many times.

Does P-trap height matter?

If your P-trap is too low, the water in it is more likely to evaporate, allowing sewer gas to flow up the line. UPC code mandates P-trap height must be 6–18 inches above floor level. This height allows for proper functionality and easy repair of the P-trap.

How far below drain should P-trap be?





Maximum Distance



However, the Universal Plumbing Code stipulates that the total developed length of all tailpieces, arms and fittings connecting the drain to the p-trap must be 24 inches or less.

What height should a sink P-trap be?

The trap is usually attached to the end of the tailpiece, and tailpieces are typically between 6 – 8 inches long (though I’ve seen up to 12). So the “standard” height of a trap would be, 6 – 8″ below the fixture.

Do P-traps have to be level?

You must install a trap level in relation to its trap seal. If the trap isn?t level, it can be susceptible to back-siphonage. Check out the diagram in Figure #2. Having said that, any plumbing fixture directly connected to the sanitary drainage system must be equipped with a water seal trap.

Can a P-trap be lower than the drain pipe?

You attach the p-trap directly to the drainage and manuever the p-traps exits into you existing drain. It is not ideal to have the p-trap below the the exit drain because water gravity has to force the water out instead of it flowing downwards naturally. They both work and have seen it many times.

Does it matter where the P-trap is located?






Quote from Youtube video: Key traps are named after their shape. They use a small bend in the pipe to drop water creating a seal this trap seal prevents sewer gases and odors from leaking into your home.

Is it OK to have 2 P traps?

Only one trap is allowed between a plumbing fixture and a trap arm by the International Residential Code (IRC P3201.

How far can shower drain be from P-trap?

Under both the IRC & UPC the maximum length of the tailpiece is 24″ vertical from the finished edge of the drain opening to the standing water level in the trap except washer standpipes.

What if new sink drain doesn’t line up with existing pipes?

In general, if the P-trap doesn’t line up with the drain, you can adjust the length and height of your drainpipes by cutting them or simply slipping them in and out of their fittings.

What happens if P-trap too deep?



When the trap is too deep, liquid may flow through it too fast, which can lead to siphoning of the trap seal and sludge buildup. The drain connection at the wall is too high on this sink, resulting in a 9-inch-deep trap seal — 5 inches deeper than is allowed by code.

Can a drain go upwards?

No, you should not do that. As mentioned in a comment, the drain is going to fill up with gunk and clog. Depending on use, you’ll find that you have to snake this line quite often.

Which is better P-trap or bottle trap?

A P flows better, a bottle uses less space. Both work, personally I would fit a P.

Does a shower waste need a trap?



According to regulations, all shower drains are required to have P-traps. This includes all fixtures connected to a building’s main plumbing system. P-traps are curved pipes installed under showers and drains of all kinds.

Do all drains need a trap?

There are traps in every drain because any connection that leads to the drain system is also a possible outlet for sewer gas. Even your toilet has an internal trap shape to its porcelain configuration that serves exactly the same function.

Do you need a trap under a sink?

Every sink, wash basin, and urinal discharging water inside a building requires a water trap at the point of connection into the waste pipework. The water trap provides a water seal between the appliance and the external drains or outside atmosphere.

What is the difference between P-trap and S trap?

Both types of traps are intended to do the same thing, which is to provide a water barrier between the inside of your home and the sewer. P-traps were designed to eliminate the main issue with s-traps, which is that they tend to siphon away too much waste water, leaving the drain “dry”.

Do you need P-trap for kitchen sink?



Even if you are meticulous about never dropping things down the drain, you still need a p-trap under your sink to keep gas out. Sewer gases can rise through the drain pipes in your home, but the u-shaped bend in the p-trap collects water. This water blocks the gases from rising up into your sink.