What Are Traps in Plumbing? | 14 Type of Trap in Plumbing

What Are Traps in Plumbing

Table of Contents

What Are Traps in Plumbing?

A plumbing trap is a plumbing sanitary system, often referred to as drain trap types or types of plumbing traps, which prevents harmful gases from entering the house. The trap is designed to be continuously filled with water.

It is important to keep these types of traps to keep the environment fresh. This type of trap prevents dirty air from entering the house.

Drain lines, which include various drain traps types and types of traps in drainage system, are made to drain water into every appliance or fitting in the house that uses water. Its connection is to the main sewer.

So there should be a trap in the pipe, through which the drain can be sealed. The gully trap is fitted with a mesh to prevent debris. The height of the water seal in the gully trap is kept at 60 to 70 mm.

Plumbing traps, including sink trap types and shower drain trap types, are made of good quality. A bent pipe is used to obtain a water seal in any trap. You may have seen different types of design traps in your home plumbing fittings like floor traps, alley traps, p-trap, etc.

Specification of Plumbing Trap

Specification of Plumbing Trap

  1. The trap should be made of good material for proper reinforcement.
  2. The trap should be properly filled with water so that harmful gases do not enter the house.
  3. The inside surface of the trap should be smooth so that water can escape easily.
  4. The quality of the trap should be good so that the water clears itself.
  5. The trap should not have grooves and its surface should be smooth so that water can be easily drained.
  6. Trap design should be simple and cost-effective.
  7. The trap should be easily fitted with the drain.
  8. The gully trap is fitted with a mesh to prevent debris.
  9. The height of the water seal in the gully trap is kept at 60 to 70 mm.

Also Read: What Is Pipe Fittings | 12 Types of Pipe Fittings

Type of Trap in Plumbing

Type of Trap in Plumbing

There are many different plumbing trap types commonly used. Which are as follows

  1. Gully Trap
  2. Floor Trap
  3. P-Trap
  4. S-Trap
  5. Q-Trap
  6. Intercepting Trap
  7. Bottle Trap
  8. Grease Trap
  9. Running Trap
  10. Drum Trap
  11. Straight Through Trap
  12. Low-Level Bath Trap
  13. Bell Trap
  14. Building Trap

1. Gully Trap

Gully Trap

The gully trap is known as the GT trap.  The plumbing trap collects water from the kitchen and washing basin.

And from there it connects to the main sewer line. Thus the gully trap serves to connect the lines of the house to the sewage line.

The gully trap is fitted with a mesh to prevent debris. The height of the water seal in the gully trap is kept at 60 to 70 mm.

For proper connection and installation of alley traps, you can usually dig less than 1 foot below the ground. The water seal should be at least 50 millimeters for the integrity of the water seal in alley traps.

So that insects and dirty gases can be prevented from entering your house. These traps are made in different places in different drain pipes.

2. Floor Trap

Floor Trap

Floor traps are installed at the bottom of sinks, bathrooms, and kitchens. Water from the floor trap goes into the outer chamber through the sewage line. The water seal in the floor trap is small.

It is used to collect wash water from the floor, kitchen, and bathroom. it is made of cast iron and PVC material.

Also Read: Type of Building Materials

3. P-Trap

P-Trap

P-traps, one of the common drain trap types, are commonly used on top floors and wall-mounted toilets. In addition, P-trap is used more in kitchens and laundry sinks. The P-trap is made of PVC material.

4. S-Trap

S-Trap

S trap, a variant among types of trap in plumbing, is used in floor mount-type toilets. This plumbing trap is also used in sinks and wash basins. S trap is used to prevent harmful gases from entering the house.

5. Q-Trap

Q-Trap

Q trap is used in the toilet underwater closet. It is used in the upper story other than the ground floor.

6. Intercepting Trap

Intercepting Trap

Intercepting trap is provided at the junction of the house drain with the public septic tank. This trap carries water to public sewage.

This trap is known as the last drainage system of the house. These types of traps are arranged in an inspection chamber. It is cleaned by an inspection chamber.

7. Bottle Trap

Bottle Trap

Bottle Trap Sink, a specific sink trap type, has a larger diameter than the plumbing pipe that comes from the basin. When water is poured in, the trap is filled with fresh water. Thus, the trap is filled with some amount of water.

8. Grease Trap

Grease Trap

This type of trap is used in the drainage system of restaurants, hotels, and industries. This type of trap requires a place where large quantities of oily substances are used.

If this oil is not removed it gets stuck in the pipe of the drainage system. It damages the pipe from the inside.

Vegetable oils and animal fats are 10 percent lighter than water and they cannot be mixed with grease. Thus, fat and oil float on top of the water. The grease trap works on this principle.

A grease trap is a chamber made of cast iron or masonry work.

9. Running Trap

Running Trap

The trap is arranged in a pipe that allows fluid to flow. So as to obstruct the gases coming from the drain.

10. Drum Trap

Drum Trap

A drum trap is placed under the washbasin. The shape of the drum trap is cylindrical. Which can be opened for cleaning by the floor plate or from below.

11. Straight Through Trap

Straight Through Trap

This type of trap has a 1¼ “inlet and outlet. This type of trap also includes a cleaning eye. It has a 75 mm water seal.

This type of trap is made from polypropylene. This type of trap allows neat plumbing for inlet and outlet connections.

12. Low-Level Bath Trap

Low-Level Bath Trap

The low-level bath trap has a 38mm seal. Thereby providing a water seal between the wastewater pipe and the interior of the room.

It prevents the odor coming from the manhole from re-entering the room through the pipe. The 38 mm water seal contains water that acts as a barrier. It also has an access pipe for overflow.

Also Read: SPC Flooring Installation | SPC Flooring Brands | SPC Flooring Pros and Cons | WPC Vs SPC

13. Bell Trap

Bell Trap

Bell traps are used in drains, garages, patios, or other outdoors. It has a water seal like any other trap.

14. Building Trap

Building Trap

The water seal in this trap is a U-shaped piece of pipe designed for unwanted gas. Building traps are essential in every home in every building.


Like this post? Share it with your friends!

Suggested Read –


Frequently Asked Questions

Traps in Plumbing

A plumbing drain trap is designed to hold a small amount of water when the sink drains; this water seals the drain and prevents sewer gases from getting into your home through the drain.

Plumbing Trap

A plumbing trap is a plumbing sanitary system. which prevents harmful gases from entering the house. The trap is designed to be continuously filled with water.

P Trap

p trap plumbing is a U-shaped bend in a waste pipe. It connects the sink drain to the home’s septic tank or municipal sewer system. There is always some water in it.

S Trap

s trap plumbing is used in floor mount-type toilets. This plumbing trap is also used in sinks and wash basins. S trap is used to prevent harmful gases from entering the house.

Sewer Trap

House traps are curved pipes of the sewer system that hold a small amount of water at all times. Your home is protected from sewer gases and pests by this water barrier.

Types of Traps

  1. P Trap
  2. Grease Trap
  3. S Trap
  4. Sink Trap
  5. Drum Trap
  6. Floor Drain Trap
  7. Flexible P Trap
  8. The kitchen Sink Clogged Past Trap
  9. Shower Drain Trap
  10. Shower P Trap

Types of Traps in Plumbing

  1. P, Q, and S-Shaped Trap.
  2. Floor Trap.
  3. Austin or Gully Trap.
  4. Bottle Trap.
  5. Grease Trap.
  6. The kitchen Sink Clogged Past Trap
  7. Shower Drain Trap
  8. Shower P Trap

What Are Traps in Plumbing?

The purpose of the p-trap is to catch water in the dip in the pipes and keep it there. After you run water down the drain, gravity will keep a plug of water in the dip. (The maximum trap seal depth is 4”.) This plug blocks the odors of decaying sewage from wafting up from the wastewater system and into your home.

What Is Ap Trap?

In a nutshell, a p-trap is a u-shaped bend in the waste pipe that connects a sink’s drain to a home septic tank or to a municipal sewer system. Under normal circumstances, p-traps always contain some water.

What Is P Trap in Plumbing?

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.

What Does a Trap Do in Plumbing?

In plumbing, a trap is a U-shaped portion of pipe designed to trap liquid or gas to prevent unwanted flow; most notably sewer gases from entering buildings while allowing waste materials to pass through.

What Is a Drum Trap in Plumbing?

Drum traps were designed to capture debris and prevent sewer gas from entering the home. In theory, homeowners would regularly open the trap and clean it to avoid clogging; however, this rarely happened in practice. Try to clean the drum trap now, and you may find that the cover has corroded and can’t be easily removed.

What Is a Running Trap in Plumbing?

Running traps (or building traps) are traps located in the drainage piping that is not directly connected to a fixture. Many older homes had running traps in the building sewer, typically in the front lawn. These traps were designed to prevent sewer gases from entering the house.

What Are P Traps For?

P-traps are designed to prevent sewer gases from seeping from pipes into your home. Prolonged exposure to these gases, which can include methane, hydrogen sulfide, nitrogen oxides, sulfur dioxide, ammonia, and more, is more than a smelly annoyance.

What Is a Bottle Trap in Plumbing?

Bottle traps have a horizontal waste water outlet and the lower half unscrews to allow the clearing of debris and blockages. Bottle traps require less space than P or S traps under the appliance and are ideal where space is limited. Due to their design, they can be prone to trapping debris.

What Is a Sand Trap Plumbing?

The sand trap serves to remove sand and coarse particles from the rainwater. When the water passes through the sand trap, the water will be slowed down and the heavier particles can fall to the bottom. Sand traps are normally made from concrete or plastic.

What Is an S Trap in Plumbing?

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.

What Do P Traps Do?

A P-trap is a bend in a drain and waste pipe with a specific purpose. That bend in the pipe contains a pocket of water, which blocks toxic, foul-smelling sewer gases (like methane) from traveling through the pipe into your home.

What Does the 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.

What Does a Plumbing Trap Do?

In plumbing, a trap is a U-shaped portion of pipe designed to trap liquid or gas to prevent unwanted flow; most notably sewer gases from entering buildings while allowing waste materials to pass through.

What Is P Trap?

In a nutshell, a p-trap is a u-shaped bend in the waste pipe that connects a sink’s drain to a home septic tank or to a municipal sewer system. Under normal circumstances, p-traps always contain some water.

P Trap or S Trap Which Is Better?

P-traps are generally considered by most to be more effective and consistent in maintaining water traps compared to S-traps. Their design makes them less vulnerable to drying out and losing their seal: a properly installed P-trap will never lose its water seal.

What Is S Trap and P Trap?

The mechanical purpose of the trap is to hold water to prevent sewer gases containing viruses and bacteria from entering the home through the drain. With an “S” trap drain, the trap is easily siphoned dry with each use and the water seal no longer exists. A properly installed “P” trap will always maintain a water seal.

What Is the P Trap Under the Sink?

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.

What Is a Sink P Trap?

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.

What Is a House Trap Plumbing?

A trap in the house drains for preventing the entrance of gases from a sewer. The purpose of the p-trap is to catch water in the dip in the pipes and keep it there. After you run water down the drain, gravity will keep a plug of water in the dip. (The maximum trap seal depth is 4”.) This plug blocks the odors of decaying sewage from wafting up from the wastewater system and into your home.

Which Is Better S Trap or P Trap?

An s-trap is so-called because of its general shape, which looks like an “S”. Likewise, a p-trap resembles a sideways “P”. 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 wastewater, leaving the drain “dry”. A dry trap allows unwanted gases to enter the home.

What Is a Trap in Plumbing Terms?

A trap is a plumbing device used to prevent smell, bacteria, also insects from entering your home. Every water-using appliance or fitting has a drain line to flow out the wastewater, and you must have a trap in the pipe that seals the drain.

What Is a Grease Trap?

  1. Grease traps or grease inceptors have been in use since Victorian times, with the first patent for a modern-day grease trap issued to Nathaniel Whiting in the late 1800s.
  2. Grease traps vary in size, with smaller variations designed to connect individual sinks and larger ones installed to service larger facilities.
  3. The definition of a grease trap is “a trap in a drain or waste pipe to prevent grease from passing into sanitary sewer lines and system.”
  4. A grease trap/grease inceptor is in simple terms a plumbing fixture that contains decomposing food waste, bettering the sewer system.

What Is a Grease Trap in a Restaurant?

Typically, grease traps for restaurants are designed so that dirty kitchen wastewater flows in, the grease trap captures fat, oil, and grease (FOG), and clear wastewater flows out into the drains.

Is a Grease Trap Required?

A grease trap is essential to the smooth running of any large kitchen and should never be ignored. To ensure that it isn’t being overloaded with grease and solids, come up with a regular cleaning schedule and hire a professional plumbing service to do a deep clean every three months.

What Is a Grease Trap in a Home?

Scrape the interior to remove any excess grease. You can also use a shop vacuum to suck out smaller bits of waste or bits stuck in hard-to-reach places. Scrub your grease trap with a steel pot scrubber and some soap and water. Flush the screens and parts out with water to remove the soap and leftover waste.

What Is a Drum Trap?

Drum traps are shaped like a drum and are about the size and shape of a two-pound coffee can. Drum traps, like any other trap, are designed to hold water in them. The water in the trap makes a seal and the seal prevents sewer gases from escaping into the house.

Are Flexible P Traps Good?

The quick answer is that they have a tendency to clog at a much greater rate than the smooth-walled pipe. Plumbing standards today require a smooth-walled pipe capable of self-cleaning to be used for sink drains and waste pipes.

Are P Traps Necessary?

The most critical task of the p-trap is to prevent noxious gases such as methane from making their way into a home. These traps also allow homeowners to quickly and easily recover small items that fall down the drain. Long story short, they’re an integral part of modern plumbing design.

Why Are Bottle Traps Illegal?

It requires more space to install, but that’s not why it has fallen out of favor or why many states have made the S-trap illegal. The reason is that the construction allows for a possible siphoning situation that causes the water to get completely drained out so sewer gases emerge from the drain.

Why Do Grease Traps Smell So Bad?

Waste sitting in a grease tank for an extended period will damage the tank and create a toxic gas that will negatively affect the device. Note that grease traps and grease interceptors will always produce a terrible smell, but cleaning them will drastically tune it down.

Floor Drain Trap

Whether indoors or outdoors, floor drains are designed to efficiently and safely direct water to a sewer or municipal storm drain so that the floor stays dry and rooms don’t flood. The purpose of traps is to prevent sewer odors and gasses from making their way through the drain and into your home.

What Is a Toilet P Trap?

An S-trap or P-trap refers to the water seal at the bottom of the toilet that stops sewer gases and smells from escaping into your bathroom. The set out of a toilet outlet refers to the outlet drainage point location.

Bell Trap Floor Drain

Bell Trap Drain is designed for use in the garage, patio, or other outdoor use. The water drains into a well in the drain unit that serves as a trap to contain sewer gas. The strainer snaps onto the drain body.

Drum Trap

Drum traps are shaped like a drum and are about the size and shape of a two-pound coffee can. Drum traps, like any other trap, are designed to hold water in them. The water in the trap makes a seal and the seal prevents sewer gases from escaping into the house.

Replacing a Drum Trap

If you have an old drum trap in your house or you’re buying an old house with a drum trap, there’s no need to get whipped up. Drum traps usually work just fine, but they’re more prone to getting clogged and can be difficult to service. Wait until a plumber is out doing other work to have your drum trap replaced.

How Does a Gully Trap Work?

A gully trap is a basin in the ground that receives piped wastewater from your house before it enters the underground sewer (wastewater pipe). The basin has a water seal to prevent odors from reaching the surface. Well-made gully traps prevent sewage from flowing into your property or public pipes.

What Is a Bell Trap?

A bell trap utilizes a basin with a bell-shaped component that fits over the vertical drain pipe. Combined, these components are designed to maintain a water “plug” that prevents gases from passing around the trap.

What Is a P-Trap?

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.

What Is an S Trap and P Trap?

An S-trap flows down from the drain, curves up then curves back down. The P-trap also flows down from the drain and curves, but the curve finishes on a horizontal pipe that takes the waste out.

P Trap Is Too Low

According to the International Residential Code, the maximum vertical distance between the sink drain and the entrance to the p-trap is 24 inches.

What Is an S Trap for a Sink?

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.

What Is an S Trap?

This brings us to the role of the S-trap. The purpose of a drain trap is to hold a small amount of water to prevent sewer gases from escaping through the sink or shower drain.

Running Trap Plumbing

Running traps (or building traps) are traps located in the drainage piping that is not directly connected to a fixture. Many older homes had running traps in the building sewer, typically in the front lawn. These traps were designed to prevent sewer gases from entering the house.

Pvc Running Trap

PVC Running-Trap is a length of pipe with a curve that bottoms out to hold pools of water that seals out gases rising from the sewer side of the pipe. Running Traps is a smooth-flowing, one-piece PVC trap. It eliminates the need for make-shift traps. The PVC Running-Traps come in two sizes.

Floor Drain Trap Seal

The trap seal opens to allow water drainage and closes tight when the water flow stops. Aids in preventing the spread of bacteria that can escape from sewers causing potential health hazards. Prevents pests such as flies, cockroaches, and rodents from crawling up through floor and shower drains.

Does a Shower Drain 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.

Why Is My P Trap Leaking?

If it’s loose, place a bucket under your P trap and then give the nut a small tightener. For a metal trap, hand-tighten it and then give it half a turn with slip-joint pliers. For a plastic trap, hand-tighten the nut and then give it a quarter of a turn with slip-joint pliers.

Why Does My P Trap Smell?

The answer to all your p-trap smells is most likely that your p-trap has dried out. A dried-out P-trap no longer has that seal of water that was mentioned before, so nothing is stopping those nasty sewer odors from escaping your drains and flowing through your place of business.

Leave a Comment