Polypropylene piping systems have entered our everyday life and replaced bulky and heavy steel systems. Polypropylene pipes have a number of advantages over metal pipes: • Withstand high coolant temperatures up to 95°C • Have high throughput throughout the entire service life • Corrosion resistant • Lightweight and easy to transport and install 1/2 brass reinforced • They are joined by a monolithic connection using polyfusion welding. Couplings made of polypropylene are used to connect polypropylene pipes. There are couplings for connecting pipes of any diameter from 20mm to 110mm. The connection is made by welding the end of the pipe into the socket of the coupling using a soldering iron for polypropylene. The result is a water-resistant connection, ready for use. In addition to the simple connection of pipes with the same diameter, when installing pipelines, there are situations when you need to switch to a different diameter or another type of pipe - for example, metal. Then, polypropylene transition couplings or reducing couplings are used, of which there is a wide variety: • PPR coupling for transition to a polypropylene pipe with a different diameter •PPR coupling for the transition to a metal pipe with an internal thread • Despite the simplicity of this fitting, it is one of the most popular when installing pipelines made of polypropylene. Polypropylene systems KOER from a Czech manufacturer in our store. KOER is Czech quality at affordable prices. When installing plumbing or heating from KOER polypropylene, use only fittings from this manufacturer.To connect two pipelines of different diameters, use KOER polypropylene adapter/reducing couplings. In our online store, a whole variety of connecting and transitional couplings is presented.