How To Choose A Rear Outlet Toilet? Best Rear Discharge Toilet

rear outlet toilet

Last updated on May 16th, 2021 at 08:02 am

What is A Rear Outlet Toilet?

Rear Outlet is such a toilet that comes with unique built and features. it has a wider pipe at the rear, connected with the toilet bowl, whose another side is connected with the main drainage pipe. It will eliminate solid waste with very little water and in a short time.

Rear outlet toilet also knows as rear discharge toilet, back outlet toilet, backflush toilet, rear flush toilet, etc. The rear discharge toilet is uncommon, and it is commonly seen in very few homes. But rear discharge comes with powerful, quick flushing, and low water consumption features. Besides, it doesn’t need much space for the trapway so you can install it in a narrow space. Moreover, you don’t have to dig the floor. These ultimate guides on how to choose the right rear outlet toilet with our 5 best rear discharge toilet reviews. 

How To Choose A Rear Outlet Toilet?

There has some efficient subject to consider before choosing a rear outlet toilet. Then your rear discharge toilet selection will be perfect.

best rear discharge toilet

Bathroom Size And Toilet Dimension:

When you are thinking of buying a rear outlet toilet, you need to measure the bathroom space first. You know that the rear outlet has a P-trap way. So, you need to have enough space in your bathroom to place this P-trap pipe.

Toilet dimension refers to the whole measurement of the toile and tank. Many times, the toilet dimension may not suit the smaller bathroom. So, choose the toilet dimension as per the toilet size.

Toilet Rough-in Size:

Rough-in refers to the distance from the basement to the outlet pipe center. You will get a different rough-in size for the different toilet. These are generally 10″ to 12″ where the 12″ rough-in is recommended. However, some toilets also come in 14″ rough-in size.

Mounting or Installing Type:

The installation method will be depending on the plumbing system your bathroom has. If your bathroom has a plumbing system to fit with the floor mount rear discharge toilet installation, choose a floor mounted. Otherwise, you may go with a wall hanging toilet.

Flushing Power:

Good to know that the rear discharge toilet can’t use the gravity power correctly when flushing. For this reason, most of the rear outlet toilets has designed with the pressure-assisted feature. The biggest advantage of Pressure Assisted is that it can remove the waste very quickly. As well as, it cannot get stuck in the toilet pipe.

Water Usage:

A rear discharge toilet will be required a minimum of 1.28 GPF water, but there are some rear discharges with 1.6 and 1.0 GPF water. So, you probably understand how much rear discharge comes with low water consumption.

 Rear discharge uses less gravity power because the removal pipe is directly connected to the drain, directly removing the wasted with clog free flushing.

Seat Height:

The rear outlet is designed with a comfortable height and regular height. You will get more than 14 inches in the regular size and 17 to 19 inches height in the comfort height toilet. If you have joint or back pain, you can take a comfortable seat height.

Bowl Shape:

The most common and popular toilet bowl shape is the elongated shape. But you can either pick up a round shape or elongated shape as per your requirement. 

Price and Warranty:

The good news for you is the cheaper price of a rear outlet toilet, and almost the entire rear outlet toilet has come with a warranty.

Best Rear Discharge Toilet In 2021



Main Features



Swiss Madison SM-2T120 Calice

  • Two Piece

  • Elongated Bowl

  • Dual Flush

0.8/1.28 GPF

American Standard Yorkville 2876.016.020

  • Two Piece

  • Pressure-assisted flush

  • Single flush

1.6 GPF

Kohler K-3652-0 Barrington

  • Two piece

  • Single flush

  • Elongated bowl


American Standard 2876100.020 Yorkville

  • Single flush

  • Elongated Bowl

  • Two piece

1.1 GPF

Signature Hardware 941039 Ever

  • Two piece

  • Dual flush

  • ADA

  • Elongated

1.6 / 0.8 GPF

1. Swiss Madison SM-2T120 Calice

Swiss Madison has the most attractive look among the best back outlet toilets. The toilet’s internal accessories are not visible due to being fully secured, so it looks smarter and modern. Additionally, there has a white color brightness throughout the whole toilet body. 

It comes with the most common two-piece style. You need to install it with some bolts and a gasket. Although, the installation is a little bit hard two-piece style is very affordable. As well, this is convenient and easy access able.

Despite being the newest model, this swiss Madison is popular for its durable built. The toilet bowl is made from a non-reactive ceramic material that doesn’t provide harmful chemical components. Besides, Swiss Madison is promising for the highest durability. 

It has an efficient dual flush function for water-saving and a rear p-trap function for quick waste removal. Besides, there have side hole systems to install this toilet easily. 

It has ADA compliant certification and 1-year of limited warranty for average technical issues. 

Swiss Madison SM-2T120 Calice Specifications

  • Dimension: 25.6 x 15.4 x 33.07 inches
  • Weight: 105 pounds
  • Bowl: Elongated
  • Color: Glossy white
  • Toilet Type: Two piece
  • Flush Type: Dual flush
  • Material: Ceramic
  • Certifications: ADA
  • GPF: 0.8/1.28 GPF
  • Warranty: 1 Year Limited Warranty

2. American Standard Yorkville 2876.016.020

American standard brand always prefers to make a beautiful appearance where the Yorkville is not separate from this preference. The bright white color finish and modern design give this toilet more beauty. Overall, Yorkville is promising to increase bathroom beauty. 

Yorkville is a two-piece rear discharge toilet that comes with a nice toilet body and tank. The tank and the toilet body need to be connected. You will get comfort when using a two-piece toilet, and this toilet tank is comparatively taller than another style. 

Among the all-reputed toilet brands, the American standard is quite good for long-lasting durability. This two-piece toilet is made with sturdy material. The bowl material is highly advanced ceramic and the tank material is strong plastic. 

Yorkville has a nice toilet bowl with a siphon jet function that offers a good water flow during the flush. At the same time, the pressure-assisted flushing ensures an ever-clean toilet surface. American Standard Yorkville  up to the 1-year warranty. 

American Standard Yorkville 2876.016.020 Specifications

  • Dimension: 29.75 x 20.5 x 29.25 inches
  • Weight: 107 Pounds
  • Shape: Oblong
  • Color: White
  • Toilet Type: Two piece
  • Flush Type: Single flush
  • Material: Ceramic
  • Flush System: Pressure-assisted siphon jet
  • GPF: 1.6 GPF
  • Warranty: 1 Year Limited Warranty

3. Kohler K-3652-0 Barrington

If you would love to use a compacted rear discharge toilet, then Kohler Barrington comes for you. It is designed with the cutest appearance with an elegant toilet tank and bowl. Especially, the bowl is unique. Your bathroom will enrich with luxurious beauty with its rear outlet toilet bowl. 

Kohler made this toilet with a traditional two-piece style. Good to know the two-piece toilet is designed with a lot of advantages. First of all, it is less expensive and lightweight. Secondly, you can replace your toilet parts anytime because of this separated design. 

In the case of good build, vitreous china is one step forward than other material. Vitreous china is made from raw materials like clay, quartz, and glass. All of these are durable, sturdy, and non-porous. Moreover, every product is tested in the company and then releases in the market. 

The most attractive function of Kohler Barrington is its pressure lite flushing function. And this function is approved by the EPA. Likewise, the rear outlet toilet front design is another excellent function. 

This toilet has come with an EPA water sense certificate and a one-year warranty.

Kohler K-3652-0 Barrington Specifications

  • Dimension: 28.75 x 21.25 x 29.25 inches
  • Weight: 102 Pounds
  • Bowl: Elongated
  • Color: White
  • Toilet Type: Two piece
  • Flush Type: Single Flush
  • Material: China
  • Flush System: Pressure Lite flushing system
  • GPF: 1GPF
  • Certifications: Watersense
  • Warranty: 1 Year Limited Warranty

4. American Standard 2876100.020 Yorkville

American standard 2876100.020  model is praiseworthy for a luxurious appearance. Vitreous China finish has added sweetness to its appearance. The toilet tank and bowl shape are beautiful enough to be suited to a modern bathroom. 

American standard back drain toilet brings happy news for you with an efficient two-piece stylish toilet. Not only the replacement but also it allows you to clean the toilet easily. Besides, you can undoubtedly pick this if you have a little budget, as this style is notably affordable. 

It is a high-quality porcelain construction material That is naturally strong. Moreover, there has vitreous china material coating to make the toilet tougher, denser, and shinier. So, you don’t need to be concern about the built quality. 

This standard American model is popular for some exceptional functions. Firstly, it has a superior function of 1.1 GPF low water consumption. Hence, the pressure-assisted siphon jet function is just wow. It has come with EPA watersense certification.  

American Standard 2876100.020 Yorkville Specifications

  • Dimension: 29.75 x 20.5 x 29.25 inches
  • Bowl: Elongated
  • Color: White
  • Toilet Type: Two piece
  • Flush Type: Single Flush
  • Material: Vitreous China
  • Flush System: Pressure-assisted siphon jet
  • GPF: 1.1 GPF
  • Certifications: Watersense

5. Signature Hardware 941039 Ever

Signature Hardware comes with a unique appearance in design and finish. It is designed with a contoured line which makes this toilet exceptional to look. There has a fine vitreous china material craft line in the base part and around the bowl. As a result, it looks luxurious. 

It is the most compacted elongated two-piece rear discharge toilet ever. Also, its tank is a slightly elongated shape. Good to know the best quality of the two-piece model. For example, a two-piece toilet easy to use, the tank is taller as well. 

This rear exit toilet from Signature Hardware is wondering for its good built. The bowl material is highly heat and corrosion-resistant. Overall, the ceramic material is super for rough use toilets. 

Signature Hardware is the most expected water-saving dual flush function. And the rear drainage pipe function is wider much than other rear p-trapway. 

This rear outlet toilet has an ADA compliant certification for the right height. 

Signature Hardware 941039 Ever Specifications

  • Dimension: 30-3/4″x 15-3/4″ x 26-1/2″
  • Weight: 91.7 pounds
  • Bowl: Elongated
  • Color: White
  • Toilet Type: Two piece
  • Flush Type: Dual flush
  • Material: Vitreous China
  • GPF: 1.6 / 0.8 GPF
  • Certifications: ADA

Wall-mounted Toilet vs Rear outlet Toilet

  • Wall-mounted is installed with the bathroom wall as a hanging position.
  • Flush type depend on toilet type and company
  • Only the toilet bowl will have seen in the wall-mounted toilet.
  • Toilet tank, trap way and water pipe all are hidden in this toilet.
  • It is designed with traditional low water consumption.
  • The wall-mounted toilet is more stylish.
  • Rear discharge is installed on the bathroom floor as a chair setting position.
  • Powerful Flush System
  • All of the included toilet parts will have seen in the rear discharge toilet.
  • Toilet tank, trap way and water pipe all are visible in this toilet.
  • It is designed with extra-low water consumption.
  • The rear outlet is designed with a traditional appearance.

Floor mounted Toilet vs Rear Outlet Toilet

  • Floor mounted needs enough larger space for installation.
  • It has come with traditional trap way at the one side of the toilet.
  • It is featured on traditional flushing system.
  • Regular water consumption
  • Back drain needs a shorter space for installation.
  • It has come with a rear back trapway drain.
  • Back drain is featured on pressure-assisted flushing
  • Very low water consumption

Advantages of Back Outlet Toilet

A rear outlet toilet has come to the market with some very interesting advantages. Here are these in a nutshell.

Advantages of back outlet toilet
  • The rear discharge toilet is looking stylish because it comes with a hidden trapway and plumbing you won’t find in a casual toilet. 
  • It provides a smoother clean line which naturally increases your bathroom appearance
  • You will get rid of digging into the floor using a rear discharge toilet because it comes with a back trapway. 
  • Pressure assisted flushing system is more powerful which can remove the solid waste quickly
  • Easy installation without drilling or digging your bathroom floor.
  • The rear outlet is far easier to repair and replace as it is directly connected with the main drain pipe. 

Disadvantages of Back Outlet Toilet

As like every bathroom fixture, a backflush toilet has some disadvantages. Here are the inconveniences of a backflush toilet. 

  • The rear outlet doesn’t come in color and design varieties.
  • It can be loose from the wall gradually as it is related to the wall.
  • It required a double pipe and connection comparatively than a casual toilet.
  • More time is needed to install and repair a rear back toilet.
  • When the connection is loose, the water drop may fall.

How To Install A Rear Discharge Toilet?

As a rear discharge toilet is an uncommon and powerful flush toilet, many new users want to know the installation process. So, here are the simple 10 steps to install a rear outlet toilet. You will need a short time and common tools for installing this toilet.

rear discharge toilet installation

Essential tools:

  • Adjustable Wrench
  • Hacksaw
  • Drill
  • Level
  • Pencil
  • PVC or ABS Glue

Step 1:

First, you have to close the water supply line of the rear back toilet installing place.

Step 2:

Are you installing a one-piece or two-piece toilet? If you install a two-piece toilet, then you have to properly slide the tank bolts to connect the tank with the bowl. Then use nut and washers to make the connection stable.

Step 3: 

Put the toilet on the exact point where you want to install it.

Step 4:

Measure the distance from the rear toilet back to the wall fitting hub to set up the pipe drainage. The pipe connector would be the standard size of 1-1/2″.

Step 5: 

Now cut the p-trapway extended part by using a hacksaw blade. At the same time, you have to set up the toilet basement on the floor on the pre-drilling holes. Now remove the toilet from the basement and create holes to mount the rear outlet toilet.

Step 6:

In this step take the PVC or ABS glue and apply it inside the hub fitting and trap connector. Now set up the toilet in the right place again and connect the p-trapway and hub fitting together.

Step 7:

When the toilet is set up properly, and the P trap is fitted, you tightened all the nuts and washer bolts. And put the T cap on the toilet base.

Step 8:

Now connect the water supply with the tank to the toilet bowl and make some flushing demo.

Step 9:

In this step, you need to set up the toilet seat on the bowl.

Step 10:

At the last step, it is important to apply the latex caulk or tile grout around the basement of the rear back toilet. Hey! you have successfully done it. Here is the YouTube video


1. How does a rear flush toilet work? 

The rear toilet is of pressure-assisted flushing, quickly releasing the water from the tank to the bowl. As a result, the waste is pushed out by the wider p-trap way. Because of being pressure-assisted, it needs very low water. 

2. How does a rear outlet toilet connect to the drain?

A toilet connects with the drain by a water supply pipe. Generally, there have two main parts of a toilet, the tank and the bowl. So, the water supply line is connected with the tank. And the tank releases the water whenever you will flush the toilet. 

Every toilet bowl has connected with a trap way. In the case of a rear outlet, there has a p-trap way wide and directly connected with the main drain pipe. 


That’s our latest guide on the best rear discharge toilet. In buying guides, we would say that a rear discharge toilet is very convenient when you have not sewer line near to the bathroom. And rear discharge is highly efficient, easy to clean, and cheaper. We recommend reading our buying guide to choose a perfect rear outlet toilet. 

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