The downpipe is used to lead the water in a controlled manner to a shoe in order to lead the water away from the foundation of the house.
These are the product pages for downpipes and accessories which directly connects to the downpipe.
Remember that the shrunk part of the downpipe is only used to lengthen pipes. All other product connections should be done without the shrunk part. They are instead dilated to make the downpipe fit inside or shrunk to fit inside the downpipe itself. This is good to keep in mind when measuring how long downpipes you need. You often cut the shrunk part of about 55 mm of both the downpipe and the intermediate pipe.