How do you tell if your toilet is S or P-trap?

An S-trap is an S-shaped trap between the toilet outlet and the sewer system. It is connected to the drainpipe through the floor. On the other hand, a P-trap is shaped like the letter P and is connected to the drainage system through an opening in the wall.


How do you know if you have a P-trap or S-trap?

The traps are types of pipes that use water to stop the escape of sewer gases. The S bend trap has the shape of an S, while the U bend has a U shape, and the P bend is shaped like a P.

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

S-Trap or P-Trap

Basiclly, an S-trap is designed to outlet directly through the floor. A P-trap means the waste outlet through a wall.


Does a toilet have an S-trap?

Toilet configurations such as S-traps and P-traps stop foul gasses and water from flowing back into the bowl and your bathroom. They also serve as a filter for debris and other objects that might stop wastewater from flowing through your sewage pipes.

Do toilets have built in P traps?

The photo below shows a "P-trap", which is the type of trap you'll find below most sinks, showers, and bathtubs. Toilets have their own built-in traps, and so do floor drains. The trap on a floor drain is located below the surface of the floor; the photo below shows a floor drain as seen from the side.


How Do P-Traps Work? 5 Drain Issues to Watch Out For



Where is the P-trap in my toilet?

The P-trap is a crucial element of the home plumbing system. It is the U-shaped section of the pipe located underneath the sink. Its function is to trap and hold enough water, which acts as a barrier to prevent sewer gases and odors from making their way into the bathroom.

Why are S traps no longer used?

The “s” design could cause a water siphon, removing the water built up in the curve, opening the seal, and allowing sewer gas to pass through. This flaw is whys-traps are no longer allowed in plumbing code and should be replaced if you have one.

What does a sewer P-trap look like?

If you look at the drain pipe under your sink, you'll see a curve in the pipe that resembles the shape of a “U” or a “P.” That's an example of a P-trap. A P-trap is a bend in a drain and waste pipe with a specific purpose.


Why is S-trap prohibited?

The “S” trap is prohibited under the Uniform Plumbing Code throughout the United States. This is because the “S” trap will siphon or suck water out from the trap which will end up releasing methane (sewer) gases into the home. So, it is a code violation and if you are doing remodeling, you will have to replace it.

Can you replace an S-trap with a P-trap?

P-traps can be used for plumbing that exits through both the wall and the floor, making them usable for any plumbing fixture. There may be some difficulty in replacing your old S-trap to a P-trap so it would be advisable to seek professional help before taking on the replacement yourself.

What is considered an S-trap?

What is an S-trap? S-traps are a type of plumbing trap that blocks sewer gases in sinks and other plumbing fixtures. The S-shaped pipe configuration traps wastewater before it drains to the sewer line, creating a water seal that prevents gases from flowing up through the drain.


Where is an S-trap located?

The most common places you'll find “S” traps are at plumbing fixtures that aren't vented, such as an illegal basement bathroom sink, a DIY basement bar sink, or a kitchen sink where the old steel drain in the wall was so corroded and blocked that someone installed a new drain, but never bothered to vent it.

When did plumbers start using p-traps?

What the P-Trap Does. The p-trap is one of the oldest pipe formations in plumbing, going back to the earliest indoor plumbing and sewer systems. (Plumbing trivia: Alexander Cummings, a Scottish watchmaker and the first man to patent the flush toilet, invented the p-trap in 1775.)

What kind of toilet do I have?

Look for the manufacturer name or a number on the bottom side of the water tank lid. It may be stamped into the lid or painted on - some of them may even be handwritten if the tank lid was replaced by a plumber with foresight.


Does an S-trap go through the floor?

The name of this toilet trap obviously comes from its unique S-like shape. It usually features a pipe that goes straight through the floor from the toilet below. That's why it's typically used when installing a toilet on the ground floor. An S-trap also takes more space around the waste outlet than other traps.

What is an S-trap toilet?

An S-trap exits at the bottom of the toilet, and is designed to outlet directly through the floor, where a P-trap exits at the back of the toilet and is designed to outlet through a wall. The Setout refers to the distance to the centre of the waste outlet.

Do toilets have pea traps?

P-traps are U-shaped pipes in toilets and underneath sinks. P-traps hold a small amount of water that prevents sewer gases from rising up into your home. These pieces of plumbing also serve several other important purposes.


Why does my toilet smell like sewer?

The vent pipe is your sewerage system's breather. When it gets clogged, the sewer gases can back up into the sinks and the toilet, resulting in your bathroom's sewage smells. You may experience a bubbling sound coming from the toilet or the drain as sewer gas forces its way into the bathroom.

Do you need to vent an S-trap?

Without a vent, an S-trap can allow the water in the fixture to drain so quickly that it often siphons the trap dry and exposes the room to sewer gases.

When were S traps used?

During the early 20th century, s-traps were a standard drain configuration. And, they were commonplace. An “S” shaped drain was installed (under a sink or tub) which typically diverted slightly and went down into a drain line under the floor.


How often should I empty my P-trap?

As a preventative measure, many plumbing experts suggest cleaning your drain and plumbing traps at least four times per year. Families with homes of six or more are strongly encouraged to clean their plumbing traps monthly to avoid clogging and limit residue buildup.

Why is a P-trap called a P-trap?

A P-trap is a U-shaped pipe under sinks and other plumbing fixtures. It's called a P-trap because it looks like a P on its side and it traps water. The P-trap holds a small amount of wastewater to prevent sewer gases from entering homes and buildings.

What are the different toilet traps?

There are three common pan types: S-trap, P-trap and skew trap. The trap is the bend in the toilet pipe that gets rid of the waste, and keeps smelly sewer gases from coming up into your bathroom. An S-trap pan has a waste pipe that's connected to the floor.


How do you unclog an S-trap?

Pour some baking soda down your drain and then pour boiling water down after. Sometimes this will clear the clog. Use a plunger on your sink drain to try to force the clog out of the trap. If these don't work, then you probably have a larger clog, and it's time to take off your drain trap.