Toilet Bowl

What You Should Know About S-Trap and P-Trap Toilet Bowls?


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Ensuring that your toilet trap is clean is an essential part of toilet bowl maintenance. This is because a clean trap means that the water seal protects your bathroom from harmful gases entering. P-trap toilet bowls are often installed due to proper venting that allows water to maintain a seal, which stops sewer gas from the sewage system. S-trap toilet bowls are also popular although they are more susceptible to releasing foul gasses. 

Below is a detailed look at the pros and cons of P-trap and S-trap toilet bowls and when they are recommended.


S-Trap Toilet Bowl 


There are a lot of things you should know before buying a toilet bowl. Among them is the type of trap the toilet bowl has and whether it is ideal for your bathroom. S-trap toilet bowls are installed in bathrooms where the drainage pipes are connected to the ground. In an S-trap, some water will remain in the trap after flushing. Another benefit of this trap is that if an object falls into the toilet bowl accidentally, it is still retrievable because of the design of the trap.

A Very Common Trap

Baron W-203A 2-Piece Toilet Bowl

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

The S-trap toilet bowl is also considered to be the most common type of toilet trap. As such, many floor-mounted toilet bowls consist of an S-trap. Besides that, many older buildings are also built to accommodate S-trap toilets.

One S-trap you should buy is the Baron W-203A 2-piece toilet bowl which is a wash-down toilet bowl that comes with a slow-moving seat cover. This Baron toilet bowl is also water efficient with a consumption of only 4.5 litres and 2.5 litres for a full flush and reduced flush respectively. Additionally, it is made from high-grade ceramics made of high-quality clay fossil that significantly increases the toilet’s lifespan. These are just some of the reasons why should you install a Baron W-203A for your home.

Some Present Drawbacks

One drawback of this type of toilet bowl is it is prone to drying due to its structure. When the trap is dry, gas and odours can travel freely through the drain pipe and into your bathroom. 


P-Trap Toilet Bowl


One of the key differences between an S-trap and a P-trap toilet bowl is how easily their trap dries out. Many newer homes and buildings are now using a P-trap toilet bowl due to its effectiveness in maintaining its water seal. This is in contrast to an S-trap which is more susceptible to dryness. 

Traps Debris and Stops Clogging

Rubine Piz Fora PF-106P07 1 Piece Toilet Bowl

Model: PF-106P07

Type: Washdown, P-Trap 180mm

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

A P-trap toilet bowl has two main advantages on top of blocking sewer gases from entering the bathroom. These are the ability to trap debris and prevent clogging. The P-trap collects any debris that may clog the pipes which makes them easy for plumbers or homeowners to remove. As a result, costly repairs that could potentially damage the whole plumbing system are avoided.

A prime example of why P-trap toilets are highly popular nowadays is the Rubine Piz Fora PF-106P07 1 Piece Toilet Bowl. This toilet bowl from Rubine showcases some of the benefits of a P-trap toilet bowl such as a water efficiency rating of 2 or 3 ticks. Another advantage of this toilet is that it is a washdown toilet bowl that has an overall dimension of 670 x 370 x 750mm. As such, it is highly suitable for nearly all bathroom setups.

Dryness of P-Trap

In deciding whether to buy an S-trap or a P-trap toilet bowl, it’s important to note that a P-trap can also dry albeit for a longer period of time. Water can also evaporate quickly if temperatures are humidity levels are high. This can happen as well if the toilet bowl installation wasn’t done properly or if an object that is absorbent is lodged in the trap.



There are a lot of things to consider when choosing between an S-trap or a P-trap toilet bowl as many bathrooms are built differently. An S-trap toilet bowl is compact and has the added benefit of catching any objects that might fall from the drain. It also has a seal to hold back unwanted gas from coming up from the sewers. On the other hand, a P-trap toilet is designed to eliminate the main issue of S-traps which is that they siphon away too much wastewater causing the traps to dry faster. 

For quality P-trap and S-trap toilet bowls, contact Everyhome Singapore. We supply high-quality bathroom products from reputed brands in Singapore like water heaters, shower sets, toilet bowls, and more. We also provide toilet bowl installation services at reasonable prices. 

Everyhome Singapore is an online home and bathroom supply store where you can shop for your home without ever needing to step out of your house across categories like a water heater, toilet bowl, aircon, shower system, bidet spray, tap, sanitary ware, bathroom accessories and more.

WhatsApp us at +65 8241 0032 with your home product needs and we will provide suitable recommendations based on your unique requirements. Check out our product buying guides and encyclopedia of product articles to learn more about home products. We are also able to provide installation services - contact us for the best pricing!

This article was reproduced from Toilet Bowl City Singapore.

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