Toilet Bowl

S-Trap or P-Trap – Which One To Buy


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The toilet bowl you have been using for a while is no longer working, so you’re thinking of having a new toilet bowl installation. You may think it is quite simple – you need to look through the various toilet bowl models offered by brands like Baron and Saniton. However, it can be much more than just choosing one and setting it up. Aside from focusing on the toilet bowl, you should also check the drain traps. Here are two options for you to choose from – S-Trap and P-Trap toilet bowls. We will help you understand each in greater detail so you can make an informed decision.


P-Trap Toilet Bowl


P-trap toilet bowls contain a U-shaped bend that filters waste as it goes into the drainage system. These bowls connect to the sewer system or a household septic tank. The P-trap is kept to hold water to prevent sewer gasses from leaking into your home.



Baron W-888 1-Piece Toilet Bowl

  • Brand: Baron
  • Model: W-888
  • Dimensions: 700d x 370w x 830h mm
  • PUB Water Efficiency Labelling Scheme: ✓✓

Installing a P-trap toilet bowl like the Baron W-888 1-piece toilet bowl is cheap and simple. If you plan to put it in a toilet bowl with a P-trap, you’ll need the necessary PVC couplings. There are many types of PVC couplings. These include a wrench compression pipe tee and nut and elbow. You can begin setting up the P-trap when you have all the tools. Typically, to create a P-trap, a hole must be cut from the floor drain and connected to the drain.

It would be best to employ professionals for your toilet bowl installation because they have years of experience and knowledge. While installing a P-trap toilet bowl is fairly simple, it may not be wise to attempt it yourself, particularly when you are keen on installing it properly. Instead, you may seek the assistance of a toilet bowl expert. The equipment you require to complete the P-trap or an S-trap toilet bowl installation may be costly. Fortunately, when you contact a plumber from Everyhome Singapore, you would not have to worry about additional costs, and you can look forward to effective results.


Suitable Setup

A P-trap is perfect for the upper floors. If you own an HDB apartment on one of the top floors, you can be certain that the P-trap toilet bowl is the best choice for you. It is recommended to engage professionals to install a toilet bowl in your HDB home to avoid problems relating to incorrect installation.


Design Advantage


In the P-trap design, looping over and returning to the bottom is impossible. Instead, it enters the horizontal run and then exits downwards. The horizontal run guides the water in a 90-degree turn, forcing it to move downward. This type of design is more common than the looping model since there is a greater chance that the water flow, as in this instance, can travel a greater distance. This is why a toilet bowl like the Saniton Camellia ST2488-SC3033 2-piece toilet bowl can easily handle a significant amount of water.

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A toilet bowl with a P-trap can consistently and efficiently maintain water traps. Cylinders with five rows and four rows may be comparable. This is because of the quantity of water they get. For P-traps, the pipes that have bigger diameters can take in water.  This is also the reason why you should choose the Baron toilet bowl to replace your old toilet bowl. This brand features a flushing technology that will allow you to efficiently reduce water consumption by 50%. They also offer a variety of other P-trap toilet bowl models that you can choose from.


Backflow Prevention

The P-trap forms the natural water seal. Water can flow into the overflow pipe, but it cannot return to the toilet bowl. The water seal that is located on the bottom of the bowl prevents any backflows from occurring. Therefore, sewer gas does not get into the trap.   There are common toilet bowl problems that you should avoid. If you choose poor-quality products, you may end up with a toilet bowl that has a poor backflow prevention device. 

Therefore, you should look into high-quality products from reputable brands and have your new toilet bowl installed by skilled professionals to prevent unnecessary costs and damage repairs.


S-Trap Toilet Bowl


One of the differences between S-trap and P-trap toilet bowls is that an S-trap toilet bowl is not equipped with a horizontal arm. It tends to curve downwards and then downwards again, forming an S-shape. The drainpipe is attached to the floor with the aid of the draining pipe. Let’s find out more about an S-trap toilet bowl in depth.



S-trap toilet bowls are generally favored for ground floor installations. This is because of its design where its pipe goes through the floor. Most often, PVC glue is used to attach them. However, pipes can be joined without glue. Installing an S-trap toilet bowl can be quite difficult. It can only be professionally done by skilled plumbers. There are things to know before buying a toilet bowl, experts would be of tremendous help. Every plumbing professional undergoes meticulous training before they can be permitted to work for you. They also have vast experience and are known for their prompt service. If you need help deciding whether to choose an S-trap or a P-trap, expert plumbers will help you choose the best option. They will take into consideration your needs and expertly finish the toilet bowl installation


Suitable Setup

An S-trap toilet bowl is ideal for ground floor areas. If you reside on the ground floor and are trying to determine what toilet bowl suits your needs, the best option is an S-trap. You can choose between the Saniton Indica ST2999-SC3122 or the Saniton Melissa ST245 S-trap toilet bowls. If you’re still unsure, you can seek advice from toilet bowl experts to get more guidance on purchasing your toilet bowl.

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Short Description:
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Design Advantage


An S-trap toilet bowl is a simple design like the Baron W203A 2-piece toilet bowl. The drainpipe is lowered from the toilet and then enters a common trap. The drain also moves down from the sink before entering the trap. Many people throw things in the toilet bowl which can cause a blockage in the drain. This is where the issue comes in with this particular design.

Baron W-203A 2-Piece Toilet Bowl

  • Brand: Baron
  • Model: W-203A
  • Dimensions: 690d x 350w x 800h mm
  • PUB Water Efficiency Labelling Scheme: 


S-trap toilet bowls may be less effective as they’re known to dry out. This makes it easier for gasses to circulate. Additionally, they can be hard to clean. While you can replace the entire S-trap system, it can be expensive. Bacteria can get into the toilet bowl which can cause common problems like odor and comfort issues. You can look into brands like American Standard and Rubine that offers top-notch quality S-trap toilet bowls such American Standard Signature CL26225-6DAPHCB Close Coupled Toilet Bowl and Rubine Piz Fora PF-106S10 1 Piece Toilet Bowl to ensure high efficiency. This will benefit you by avoiding frequent toilet bowl issues in the future.

American Standard Signature CL26225-6DAPHCB Close Coupled Toilet Bowl

  • Brand: American Standard
  • Model: Signature Close Coupled CL26225-6DAPHCB
  • Dimensions: L684mm x W406mm x H780mm

Rubine Piz Fora PF-106S10 1 Piece Toilet Bowl

Model: PF-106S10

Type: Washdown, S-Trap 250mm, Bottom Connection

Colour: White

Dimensions: 670 x 370 x 750mm

Water Efficiency: Available in 2 ticks and 3 ticks

Water Consumption: Full Flush (4.00L) / Reduced Flush (2.80L) or Full Flush (3.50L) / Reduced Flush (2.50L)

Package Included: One-piece WC + Seat cover

Warranty (T&C’s Apply): 1 Year Parts + Service / 10 Years On Ceramic Deformation

Backflow Prevention

The S-trap toilet bowl comes with an air filter. It blocks the flow of sewer gasses back into your home without eliminating the gas from the sewer.


Choosing Between a P-trap Or an S-Trap

An S-trap toilet bowl and a P-trap toilet bowl serve the same purpose. However, they become different when it comes to deciding which one is the best for your home. In that case, it is crucial to think about the installation specifications and the potential risks.

Despite being one of the most common types of traps, S-trap toilet bowls present some drawbacks. It can take up a lot of room towards the back of the toilet bowl. Thankfully, Everyhome Singapore offers the TOTO C636CDE, a compact toilet bowl that will save space in your bathroom.

This type of toilet bowl may not be ideal for you if you have a small space in your bathroom.

A trap can allow rodents to enter your home if the trap is dry for long enough. The trap could let harmful sewer gases enter your home due to its design, which you do not desire. The American Standard Milano CL20415-6DACTCB is a P-trap toilet bowl that may be a good option.

TOTO C636CDE 1-Piece Toilet Bowl

Flush system : TORNADO FLUSH
Water Use : 4L / 3L
Trap Type : S Trap
Rough-in : 305 mm
Bowl Shape : Elongated
Water Pressure : 0.05MPa ~ 0.70MPa
Size : 490W x 740D x 670H mm

American Standard Milano CL20415-6DACTCB 1-Piece Toilet Bowl

  • Brand: American Standard
  • Model: Milano CL20415-6DACTCB
  • Dimensions: L760mm x W422mm x H707mm


If you plan to buy a new toilet bowl from one of the best-selling toilet bowl brands, you may contact Everyhome Singapore. Our team of professionals can guide you on the different features of each brand so you can buy the right toilet bowl for your home. You may also use our toilet bowl buying guide for you to be able to choose the best toilet bowl that suits your needs.

Everyhome Singapore is an online home and bathroom supply store that provides the listening ear and guidance you need to make sense of the thousands of home and bathroom products in the market. Let our online support help you find the best product within your budget by calling or WhatsApp us at +65 8241 0032 for all your home product needs. We can also provide installation services should you require them - contact us for the best pricing!

Our encyclopedia of buying guides and articles cover product categories like a water heater, toilet bowl, aircon, shower set, bidet spray, tap, sanitary ware, bathroom accessories, and more.

This article was reproduced from Toilet Bowl City Singapore.

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