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The Keller PEX system, based on the use of multi-layer pipe connected by pressing, belongs to the group of the most modern installation solutions on the market. It is determined by two factors: the construction and technique of joining pipes that have a multilayer structure. Their core is an aluminum pipe with a thickness of 0.2mm longitudinally welded, ultrasonically "overlapped", which withstands a pressure of 10 bar. When the aluminum layers (PERT) are applied to the outside and inside, fixed to the aluminum with a special binder, we obtain a pipe that can work under simultaneous pressure and temperature at 10 bar and 95 ° C respectively. This combination of plastic and traditional material makes Keller PEX pipes a unique combination of the advantages of plastic and metal, and are resistant to corrosion and scaling.