- all the materials, pipes and accessories to be used in the cold, hot and drain water networks, will be of good quality in accordance with the technical rules of "itintec" and with the standards in the national construction regulation. - cold water pipes will be pvc. rigid class 10, from union to simple pressure and / or threaded union, including its accessories. thermal insulation. - the gate valves will be of bronze seat, in each valve a universal joint will be installed, when it is a visible pipe and two universal joints when the valve is installed in a box. download DWG file of house sanitary with plumbing layout plan drawing AutoCAD file.