Proper connection of the toilet bowl to the sewage system

The toilet is one of the most necessary devices in the house. Currently, many types and types are proposed. With all the variety of designs, the toilet is connected to the sewer according to the same rules.

Dimensional drawing and mounting of a toilet bowl

Dimensional drawing and installation of a toilet bowl.

If the house has a centralized sewage system, installing and connecting the toilet to the sewer does not require a person special skills. Such work can be done by yourself. It is important to take into account some mounting features and learn the instructions.

Toilet construction

The whole system includes a toilet bowl, a drain tank, a water connection system, a tank connection system with the appliance and a sewage connection system. The toilet bowl is a monolithic structure consisting of the following elements (zones): a neck (a drain hole), a water distributor, a distributor ring, a bowl, a drain outlet, an outlet, a discharge chute, a pedestal for the tank, a stiffener, a water seal, mounting elements for fixing to the floor and fixing the cover.

The design of the toilet bowl

The design of the toilet bowl.

The structures are mainly porcelain, porcelain and semi-porcelain. By the type of bowl it is customary to divide into funnel, visor and plate bowls. In addition, there are toilet bowls with a shelf for securing the tank and without a shelf.

Connection of the toilet bowl to the sewer pipe is made through a special reflux in the form of a branch pipe (outlet). Depending on its location and type, the output is direct or oblique. Slanting outlets leave the device at an angle of 60 °. Direct releases are horizontal and vertical, depending on the direction of their exit from the toilet. All instruments have a channel that provides a hydraulic seal over the outlet by maintaining a column of water.

Connection system

In general, the system for connecting the toilet to the sewage system consists of a tee (cross) of the sewage pipe, branch, pipes, fittings (adapters) and the toilet outlet. The purpose of such a system is to provide a reliable connection of any type with a sewer pipe.

Tee (cross) is designed for direct plugging into the sewer pipe (pipe). It connects two sections of the sewer riser and has a lateral branch pipe with a socket for connecting the toilet. The tee is installed below the installation level of the base of the device.

Types of toilet bowls

Types of toilet bowls.

To create a slope for spontaneous drainage, a elbow fitting (socket with a bell) is used. Between the riser and the device is installed a branch, which is a length of pipe length determined by the distance to the plumbing fixture. The tap can be plastic or metal. The use of fan tubes, that is, pipes made of earthenware or porcelain, which are very well combined with the material of the toilet itself.

The right direction and angle of connection to the toilet outlet are provided by the nozzle. It can be made of plastic or metal pipe with a bell. Due to its versatility, corrugated plastic pipes have become widely used. At installation of such branch pipe it is possible to refuse installation of tap (if the toilet is established near to a riser of the water drain). The main advantage of the corrugated pipe branch is the ability to bend in any direction and pull (or compress) to the desired length. Corrugations of different lengths are realized. The connection is provided by a fitting (clutch). Until recently, the couplings were rubber cone or stepped. Now the use of plastic couplings is more common. In particular, an eccentric plastic clutch is recommended, which allows to eliminate small deviations in the level of the bend assembly when fastening to the toilet outlet. All connection details are standardized, and they are easy to purchase.


Scheme of connection of a toilet bowl to the sewerage from cast-iron pipes

Scheme of connecting the toilet to the sewer from the cast-iron pipes.

Before deciding how to connect the toilet to the sewer, it is necessary to properly assemble and install it. Basically, two types of fastening are used: directly to the floor or through the taffeta. Fastening directly to cement or tiled floors is done using dowels. To do this, put the device, marked the place of attachment in the floor. On the marks are drilled holes with a perforator or an electric drill. Dowels are installed. The device is fixed with large screws. Between the screw cap and the toilet, a plastic sleeve (gasket) must be installed, so as not to damage the toilet. The gap between the floor and the plumbing device shpatlyuetsya.

Taft is a board of solid wood, which is thoroughly impregnated with linseed oil and fixed on a concrete floor screed. Fastening taffeta is made with the help of anchors. The surface of the taffeta is set horizontally using the level. To install the taffeta it is recommended to leave the appropriate groove in the concrete. On the wooden base, the toilet is attached tightly and firmly.

Connection Features

Installation унитаза с нижним вертикальным выпуском производится только тогда, когда канализационный слив подведен снизу под прибор, т. е. смонтирован до наложения бетонной стяжки. В этом случае над поверхностью пола присутствует только патрубок слива. Подключение унитаза с нижним вертикальным сливом производится достаточно просто. На слив устанавливается стандартный резьбовой фланец с фиксатором. На выпуск унитаза закрепляется выпускная манжета, имеющая уплотнительное кольцо. Устанавливается прибор так, чтобы манжета прижалась к трубе канализации. Поворачивается фланец до полной фиксации. За счет сжатия уплотнительного кольца обеспечивается герметичность стыка.

Connecting the toilet bowl to the sewer system through the funnels

Connection of the toilet bowl to the sewerage system through the chimneys.

Connecting the toilet bowl with a horizontal outlet has its own specifics, since the outlet is located high enough from the floor behind the toilet and has a horizontal direction. When connecting such a toilet bowl to the sewage system, it is necessary to use sealing cuffs in the nozzles adjacent to both the sewer pipe and the outlet. In addition, it is necessary to change the direction of the pipe due to the use of elbows.

Connecting a plumbing fixture with an oblique outlet does not require a bent pipe. The direction of the drain to the side of the sewer pipe is determined by the slope of the toilet outlet. Before fixing it is recommended to prepare the release of the toilet bowl. To do this, first release the lubrication mixture of groundweed with linseed oil. A tarred fiber (yarn) is wound on top of the dried mass with an indentation from the edge of the outlet by 5 mm. Above it is again superimposed a mixture of wax and olive oil.

Corrugated pipe

Канализация соединяется с унитазом при помощи гофрированной трубы. Corrugated pipe устанавливается на отвод. Место установки промазывается силиконом. С другой стороны труба ввинчивается в пластиковую манжету и герметизируется силиконом. Если место установки унитаза позволяет, то гофрированная труба устанавливается прямо на патрубок канализационной трубы. При этом гофра растягивается на нужное расстояние, а соосность с выпуском унитаза обеспечивается изгибанием трубы.

Connection Features

The quality connection of the toilet bowl to the sewage system is also determined by certain rules of connection to the sewage pipe. The tee pipe tee has a socket for connection to the toilet flush system. If it is made of cast iron, the smooth end of the branch pipe (usually a polypropylene pipe) is inserted into the socket via a gasket of a rubber seal with a diameter of about 106 mm and a thickness of up to 9 mm. The joint is filled with an expanding cement mixture. Instead of rubber, you can use tarred yarn. If a plastic tee is used, then the nozzle must also be of this material. The joint is sealed by heat treatment before melting the plastic.

When using adapters, the connection can be provided with rubber cuffs and clamps.


In order to decide how to connect the toilet to the sewer, first of all, you must prepare the tools in advance:

Installation подвесного унитаза

Installation подвесного унитаза.

  • Bulgarian;
  • perforator;
  • electric drill;
  • vise;
  • a hammer;
  • metal cutter;
  • knife;
  • scissors;
  • screwdriver;
  • bits;
  • hacksaw;
  • putty knife;
  • screwdriver;
  • pliers;
  • set of wrenches;
  • the key is sanitary;
  • Adjustable wrench;
  • file;
  • paint brush;
  • vernier caliper;
  • the meter line;
  • roulette;
  • construction level.

The scheme of connecting the toilet to the sewage system depends on its design. First, you need to choose the optimal design of the drain using modern quality parts. It should be remembered that errors in connecting the toilet can lead to great trouble. In general, the connection is quite simple, you can do it yourself.

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