Types of Plumbing Traps

Different Types of Plumbing Traps

What Is a Plumbing Trap?

What Is a Plumbing Trap?

A plumbing trap is a device that allows waste material to pass through but stops foul gases from entering the house by providing a water seal.

These devices are shaped with a bending path. plumbing traps are usually S, Q, P, and J shaped. The most common and most used among these is P shaped.

Sewage creates many foul gases like carbon monoxide, sulfur, methane, etc which are injurious to health. The process of producing these gases in sewers can not be stopped but we can prevent these gases from entering the house by using a plumbing trap.

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Different Types of Plumbing Traps

1. Floor Trap or Nahni Trap

Floor Trap or Nahni Trap

A floor trap or Nahni trap is used in the bathroom, kitchen sink, wash basin, wash area, etc places to collect wastewater. As appeared by the name, this kind of trap is situated on the floor.

The diameter of a floor trap or Nahni trap is usually made of 80 millimeters. The depth of the water seal that is provided in it is 50 millimeters. Its length of it is 310 millimeters with a 30-millimeter diameter at the outlet end and 80 millimeter minimum at the inlet end. Outside the outlet of a floor trap, the diameter is 73 millimeters.

Floor traps prevent the foul gases which form in the drainage and sewer from entering the house. It builds a water seal and this water seal stops the foul gases from entering the house and causing a bad odor.

Floor traps are available in many materials. You can find floor traps made of UPVC, PVC, and CI. They do not have a vent pipe but at the top of the traps, a removable grating is provided. The size of the grating is 95 millimeters. The grating contains 8-millimeter holes at the top.

These types of traps come in a different variety of sizes, shapes, and outlet conditions. Many floor traps do not have any water seals. These floor traps have a rough and non-uniform bore.

Due to the poor design of floor traps, they are a major source of leakages. The casting and quality may also be poor in these floor traps. To prevent this and provide a positive joint deal seal P traps are used with multi-inlet traps with connections from the wash basins.

2. Gully Traps

Gully Traps

Before connecting the drainage pipe with the city sewer system a gully trap is provided outside of the building. It also collects wastewater from the wash basin, kitchen sink, bath, and wash area.

The total depth of a heavy cast iron gully trap shall not be less than 30 centimeters or 1 foot. The weight of the cast iron gully trap shall be around 7.25 kg. The weight of the frame is nearly 2.72 kg and the weight of the cover is nearly 4.53 kg.

A gully trap is provided to prevent the foul gases formed in the city sewer system from entering the house. It blocks the gases by the water seal inside it. The water seal is a little deep and the depth is nearly 50 millimeters.

The gully traps also prevent bugs and insects from the sewer system from entering the house. With a minimum water seal of 50 millimeters, the total depth of water shall not be less than 15 centimeters.

Every gully trap should have a cast iron grating of 15 centimeters × 15 centimeters and it must be embedded in the concrete foundation perfectly and in a brick masonry chamber, it must be housed.

Plaster the chamber well and fix one airtight and watertight cover over the frame of inside dimensions of 30 I’m × 30 cm. Gully traps receive sullage from wash basins, kitchen sinks, and baths and they pass it onto the sewer.

If a gully trap is installed then it is unnecessary to install individual traps for kitchen sinks, washbasins, and baths. To prevent choking gully traps need to be cleaned regularly.

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3. P Traps

P Traps


  • This type of trap is utilized with the Orissa pattern Indian water closet.
  • P traps are made of either UPV sheets or cast iron.
  • P traps also have a water seal which prevents sewer gases from entering.

4. Q Traps

Q Traps

  • The utilization of q traps takes place in the submerged latrine storage room.
  • The shape is a little different from S traps.
  • Q traps are used in the upper story.

6. S Traps

S Traps

  • These traps are shaped like the English alphabet ‘S’.
  • To fix the water closet of the latrine, these traps are used.
  • S traps are used for an outlet through the floor.

7. Bottle Traps

Bottle Traps

  • Bottle plumbing traps are set to the washbasin, kitchen sinks for collecting squander from those.
  • In different types of machines where the apparatus does not have an underlying trap.

8. Intercepting Traps

Intercepting Traps

  • Intercepting traps are used in the interceptor chamber or interceptor manhole. It is utilized at the interception of the building sewer and city sewer.
  • Intercepting traps stop from entering foul gases of the sewer system into the building by providing a good water seal.
  • The depth of the water seal in intercepting traps is 100 mm. This deep water seal also prevents bugs and insects from entering the house.

9. Grease Traps

Grease Traps

  • To separate grease from liquid and then retain it, grease traps are used.
  • These are installed at the waste pipe from one or more fixtures.

Frequently Asked Questions (FAQs): 

Types of Plumbing Traps

In brief, there are different types of traps in Plumbing: Floor Trap or Nahni Trap, Gully Trap, P Trap, Q Trap, S Trap, Intercepting Trap, Bottle Trap, Grease Trap. They are available in different materials like PVC, GI, etc.

Types of Gully Trap

The two main types of gully trap are the P trap and the bottle trap. The P trap gets its name from its shape. It is a plumbing fixture where water runs into an opening called a gully hopper, this leads to a pipe that curves at the bottom and goes back upwards before joining the main underground drainage system.

Types of Floor Trap

Types of Traps in Plumbing

  1. Floor Trap or Nahni Trap.
  2. Gully Trap.
  3. P Trap.
  4. Q Trap.
  5. S Trap.
  6. Intercepting Trap.
  7. Bottle Trap.
  8. Grease Trap.

Traps 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.

2 Main Types of Trap

There are two major categories of traps, and are classified based on how the petroleum accumulates. The two main groups are structural traps and stratigraphic traps.

Uses of Traps

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

How to Set a Wooden Mouse Trap?

Wooden mouse traps typically have a U-shaped, spring-loaded bar and wire latch that is attached to a small board. How to Set: Bait the trap, pull the spring bar back, and secure it with the wire latch. Place the trap where mice travel (look for droppings or oily marks along baseboards).

Importance of Traps in Plumbing

The reason for the plumbing trap is to create a barrier in the drainpipe that prevents sewer gas from rising back up through the drain and into the house. Sewer gas naturally rises, and it would drift up into living spaces through drains unless blocked.

What Is the Pipe Under the Sink Called?

Trap: A P-trap is a two-part pipe under your sink that allows waste and water to pass through. The bend in the pipe prevents sewer gasses from entering.

What Is the Curved Pipe Under the Sink Called?

This pipe section is called the p-trap. You might wonder why it isn’t called the u-trap because of the shape of the curve.

What Is a Drain Trap?

A drain trap, or P-trap as it is most commonly known, is the u-shaped trap between your plumbing and drain that prevents the harmful gasses from moving back up through your pipes into your kitchen or bathroom. It also catches debris, hair, dirt, and other unattractive sludge from coming through your pipe system.

What to Put in a Raccoon Trap?

Raccoon Bait to Trap and Relocate Raccoons

  1. Marshmallows. Marshmallows make a great bait for raccoons.
  2. Wet Cat Food. The stinkier, the better.
  3. Bacon. Speaking of oily meats, bacon attracts raccoons really well.
  4. Fresh Fruit.
  5. Canned Tuna or Salmon.
  6. A Whole Egg.
  7. Sweet Corn on the Cob.
  8. Sugar or Honey-Coated Veggies.

What to Do with a Raccoon in a Trap?

Because raccoons are a rabies vector, they cannot be trapped and relocated under any circumstances. All trapped raccoons must be euthanized or released on the property where they were captured.

What Is the Purpose of a Trap in Plumbing?

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. The toilet has a built-in trap that keeps the bowl partially filled at all times.

What Is the Purpose of Ap Trap?

What is a P-Trap Used For. 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.

Where Is the P Trap Located in a Toilet?

A toilet trap, or trapway, is a curving channel inside the base of a toilet that leads from the hole at the bottom of the bowl to the drainpipe.

Where Is the House Trap Located?

A trap is a U shaped pipe located under sinks, tubs, shower, washing machines, and pretty much anything that connects to your sewer line system. They can be seen quite easily, just open up the cabinet under the sink in the kitchen or look at the side of the toilet.

Why Does My P-Trap Smell?

A P-trap is the curved portion of pipe under the sink. It’s supposed to create a seal by holding water, which prevents sewer gases from getting into the bathroom. If the P-trap isn’t working properly, sewer gasses can make their way into the bathroom and cause your sink to stink.

How Does a Water Trap Work?

The water trap provides a water seal between the appliance and the external drains or outside atmosphere. The water trap will prevent smells, insects and bacteria coming back up the waste pipework into your building. The trap will only work and prevent smells when it has water inside which provides the water seal.

Do Toilets Have Traps

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.

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