Installing a washing machine into a PVC riser

Connecting a washing machine to the sewer is, in our time, quite simple and inexpensive. Any DIYer can handle connecting the machine to the water seal under the sink, but it happens that the drain needs to be connected to the riser.
The easiest way to do this is on the top floor of an apartment building, since in this case there is no need to negotiate with the residents of the house. Otherwise, you will have to go around to all the residents living above and ask them not to use the sewer during the work.
Let's look at the drain insert in more detail using an example.
As a rule, the riser has a diameter of 110 mm. In the example below, the pipe diameter is 50 mm, it consists of two parts and is located on the top floor. Therefore, when you make your insert, you should take into account the design features of your particular riser. This applies to the diameter and possibly additional parts not described in the example.


For insertion you will need the following tools and parts: a hacksaw, a stationery knife, a tee with a branch diameter of 50 mm and an angle of 45 degrees, a compensation pipe and a cuff for inserting the drain hose of the washing machine.

First, preparatory work is carried out. The rubber o-ring is removed from the branch of the tee and a cuff is inserted in its place.

Next, the tee and expansion pipe are assembled together.

The assembled parts are applied to the insertion site, so that the lower edge of the tee lies at the level of the beginning of the pipe expansion. The length of the cut section is marked on the riser. On the compensation pipe, in this case, there are marks by which you can easily measure the cut section of the riser (along the top mark on the compensation pipe).

After the preparatory work, you need to agree with the residents living above you so that they do not use the sewer system during the work.
The actual work on inserting the drain should be carried out as quickly as possible, because you are not insured against the fact that one of the residents living above will forget about the agreement with you and drain the water into the sewer.
Next, cut off the marked section of the riser.

Remove the shavings and use a utility knife to chamfer the outside of the pipe.

Insert the tee into the downpipe of the riser. Insert the upper part of the riser into the tee. Install the expansion pipe by bringing all the pipes together. The pipes must be inserted into each other all the way down, so that over time they do not move down under their own weight or as a result of mechanical stress.
TIP: Wet the ends of the pipes with water - this will make it easier to assemble the pipes together.

If possible, it is advisable to install the compensation pipe under the ceiling to prevent the riser pipe from sliding down under any circumstances.

If desired, you can completely eliminate the spontaneous movement of the expansion pipe by gluing a ring from a piece of pipe to the riser below it.


Install the washing machine drain hose into the tee.