Tools and materials
Rigid plastic pipes, couplings, T-joints, comer joints for the new installation, appropriate glue, sandpaper, metal bow saw, clamps and screwdriver.

Before buying
- There are different types of rigid plastic available, depending on the installation. If the piping is for drinking water, purchase plastic made from a special material.
- The way of joining the pipes is similar, as is the way of installing them.
- The diameter of the pipes also depends on their function, whether they are for channelling water or evacuation purposes.

Cut to size
- Measure all the distances from the joint to where you wish to install the new toilet or tap. Calculate the number of metres of piping required and the number of joints, couplings, etc. required to surmount all the obstacles on the way.
- Cut the pipes before connecting them. Remember that the fewer joints there are the better.
- Mark a cutting line on the pipe with a marker pen and cut through using a metal saw.
- Then gently sandpaper the area with fine sandpaper.
- Set up a trial installation without gluing any of the pipes and joints (couplings, comers, joints) to ensure that it reaches the point required.

Joining and gluing
- Now is the time to join all the pieces together. With a pen mark a small perpendicular line that crosses the joint areas of the two pipes so that you will know where to join them.
- Spread the special glue across the two rigid plastic pipes to be joined. Using the lines as a guide immediately stick the two pieces strongly together and hold them firm for a few seconds.

Attaching the pipes to the walls
- The most common way of attaching the pipes to the walls is with metal clamps.
- Install as many as necessary for the pipes to be firmly attached. Mark the spot, drill away and slip in the plugs to which the clamps will be attached with screws.
- Unscrew one side of the clamp and insert the pipes. Place the clamp back on and screw in.

Connections
- Water pipes in the home are usually made of copper.
- In order to join plastic piping to those you should use the appropriate joints and connectors. You should bear in mind the size of both pipes.
- The new piping should be connected with a T-joint to the existing network if you have no other media. To do this you will have to access the piping and make the connection. If the pipes are made of copper and you have to saw into them, you should then solder them to ensure there are no leaks.
- If you already have a plastic installation in some part of the house, it will be a whole lot easier since the joints will already be fixed.
- Make sure the water mains are closed when you are working and also make sure the pipes are dry for the glue to stick.
- It is best to install a stopcock in the new installation. If there are problems you can thus ensure the general network is not affected.
- The new pipes, joints and siphons will emerge from the new installation to the toilet, sink, washing machine, dishwasher or hose tap.